把当前目录中所有扩展名为EXE文件换名为BAT文件，用（）命令。

A:REN*.BAT*.EXE B:REN？.BAT？.EXE C:REN*.EXE*.BAT D:REN？.EXE？.BAT

关于PLC所使用的后备锂电池及其BAT指示灯，下列说法正确的有（）

A:BAT指示灯存在2种状态，红色，熄灭，绿色 B:若BAT指示灯为红色，表示电池已经用完 C:若BAT指示灯熄灭，表示电池正常 D:锂电池作为后备电池，需要定期更换

电源系统是如何向“28V DC HOT BAT BUS”提供电源的？（）

A:将驾驶舱头顶P5-13面板上的“BAT”电门设置到“BAT”位置 B:将驾驶舱头顶P5-5面板上的“STAND BY POWER”电门设置到“AUTO”位置 C:将驾驶舱头顶P5-5面板上的“STAND BY POWER”电门设置到“BAT”位置 D:电瓶直接与“28VDCHOTBATBUS”相连接

当P5头顶板上的“BAT”（电瓶）电门设置到“ON”位后，电瓶将向（）提供电源。

A:28V DC HOT BAT BUS B:28V DC SWTICHED HOT BUS C:28V DC BUS1 D:28V DC BUS2

当BAT供电时，以下哪个继电器断开（）。

A:BAT BUS ALT（.K1） B:STBY DC ALTN RELAY（K3） C:STBY NORMAL（K5） D:SW HOT BAT BUS RELAY（K8）

What’s killing the Bats First it was bees. Now it is bats. Biologists in America are working hard to discover the cause of the mysterious deaths of tens of thousands of bats in the northeastern part of the country. Most of the bats affected are the common little brown bats (Myotis lucifugus), but other species, such as the long-eared bat, the small-footed hat, the eastern pipistrelle, and the Indiana bat have also been affected. In some caves, more than 90 percent of the bat populations have died. One possibility is disease. A white fungus（真菌）known as fusarium has been found on the noses of both living and dead bats. However, scientists don’t know If the fungus is the primary cause of death, a secondary cause of death, or not a cause at all, but the result of some other conditions. Another possible cause is a lack of food. For example, bats typically eat a large number of moths（蛾）, and in some states such as New York, the number of moths has been declining in recent years. If bats can’t eat enough food, they starve to death. Still other scientists believe that global warming is to blame. Warmer temperatures in recent years have been waking up hibernating（冬眠）bats earlier than usual. If bats break their hibernation at the wrong time, they might not find their expected food sources. The weather might also turn cold again and weaken or kill the bats. Scientists might not agree on the causes of the bat die-off, but they do agree on the consequences. Bats are an important predator of mosquitoes; a single brown bat can eat 1,000 or more insects in an hour. They also eat beetles and other insects that damage plant crops. If there aren’t enough bats, damage will be great from the insects they eat While bats live a long time for their size－the little brown bat can live for more than 30 years－a female bat has only one baby per year, so bat populations grow slowly. Many bat species in the United States are already protected or endangered. How can you help? Do not disturb sleeping or nesting bats. If you discover bate that seem to be sick or that are dead, contact your local Fish ＆ Wildlife Department with the details. However, be careful not to touch the animals. The word “pipistrelle" in Paragraph 1 refers to

A:a kind of fungus. B:an area in the U.S. C:a special cave. D:a kind of bat.

What’s killing the Bats First it was bees. Now it is bats. Biologists in America are working hard to discover the cause of the mysterious deaths of tens of thousands of bats in the northeastern part of the country. Most of the bats affected are the common little brown bats (Myotis lucifugus), but other species, such as the long-eared bat, the small-footed hat, the eastern pipistrelle, and the Indiana bat have also been affected. In some caves, more than 90 percent of the bat populations have died. One possibility is disease. A white fungus（真菌）known as fusarium has been found on the noses of both living and dead bats. However, scientists don’t know If the fungus is the primary cause of death, a secondary cause of death, or not a cause at all, but the result of some other conditions. Another possible cause is a lack of food. For example, bats typically eat a large number of moths（蛾）, and in some states such as New York, the number of moths has been declining in recent years. If bats can’t eat enough food, they starve to death. Still other scientists believe that global warming is to blame. Warmer temperatures in recent years have been waking up hibernating（冬眠）bats earlier than usual. If bats break their hibernation at the wrong time, they might not find their expected food sources. The weather might also turn cold again and weaken or kill the bats. Scientists might not agree on the causes of the bat die-off, but they do agree on the consequences. Bats are an important predator of mosquitoes; a single brown bat can eat 1,000 or more insects in an hour. They also eat beetles and other insects that damage plant crops. If there aren’t enough bats, damage will be great from the insects they eat While bats live a long time for their size－the little brown bat can live for more than 30 years－a female bat has only one baby per year, so bat populations grow slowly. Many bat species in the United States are already protected or endangered. How can you help? Do not disturb sleeping or nesting bats. If you discover bate that seem to be sick or that are dead, contact your local Fish ＆ Wildlife Department with the details. However, be careful not to touch the animals. The "moths" in Paragraph 3 are taken as an example of

A:diseases that kill bats. B:Insects that bats eat. C:animals that have diseases. D:bat species that are starving to death.

在窗体上画一个通用对话框，其名称为CommonDialogl，然后画一个命令按钮，并编写如下事件过程：
Private Sub Command1_Click（　）
CommonDialogl.Flags=cdlOFNHideReadOnly
commonDialogl.Filter="All Files(*.*)|*.*| Text Files"&_
"(*.txt)|*.txt|Batch Files(*.bat)|*.bat"
CommonDialogl.Filterlndex=1
CommonDialogl.ShowOpen
MsgBox CommonDialogl.FileName
End Sub
程序运行后，单击命令按钮，将显示一个“打开”对话框，此时在“文件类型”框中显示的是 ______。

A:AllFiles(*.*) B:TextFiles(*.txt) C:BatchFiles(*.bat) D:不确定

在窗体上画一个通用对话框，其名称为CommonDialog1，然后画一个命令按钮，并编写如下事件过程：
Private Sub Command1_Click（　）
CommonDialog1.Flags=cdlOFNHideReadOnly
CommonDialog1.Filter="All Files(*.*)｜*.*｜Text Files" &_
"(*.txt)｜*.txt｜Batch Files(*.bat)｜*.bat"
CommonDialog1.FilterIndex=2
CommonDialog1.ShowOPen
MsgBox CommonDialog1.filename
End Sub
程序运行后，单击命令按钮，将显示一个“打开”对话框，此时在“文件类型”框中显示的是______。

A:All Files(*.*) B:Text Files(*.txt) C:Batch Files(*.bat) D:不确定