用于灭菌检测化学指示剂有指示卡、指示管和指示胶带。正确的是

A:指示卡和指示管用于各种物品包装表面检测 B:指示胶带用于物品包装表面检测 C:物品包装表面灭菌检测可用指示卡在各包装外贴封 D:指示管用于各种物品包装表面检测 E:指示卡用于各种物品包装表面检测

一只电动比例温度调节器，温度刻度范围是50~100℃，电动调节器输出是0~10mA，当指示指针从70℃升到80℃时，调节器相应的输出电流从3mA变化到8mA，其比例度为（）。

A:20℃ B:5mA C:40% D:2.5

指示

下列不是MA的分类的是（）。

A:SMA B:WMA C:FMA D:EMA

C 　　Ma Lili’s parents are going to give a birthday party for her. She’s going to be fourteen years old. Ma Lili has a lot of friends. They are going to come to the party. They are girls from Ma Lili’s school. There are twentyfive of them. 　　Ma Lili’s mother is making birthday cakes for the party. They are very nice cakes. Ma Lili says to her mother:“Mum, you’re very nice. Thank you for your nice cakes.” Her father is going shopping. He buys a lot of apples, bananas, oranges and pears. 　　It’s four o’clock in the afternoon. Now everything is ready. The party begins in thirty minutes. Who is going to give Ma Lili a birthday party（ ）

A:Ma Lili B:Her friends. C:Her teacher. D:Her parents.

成年男性的平均感知电流约为 （ ）mA

A:0.7mA B:1.0mA C:1.1mA D:1.5mA

道路指示标线是(　)。

A:促使道路使用者了解道路上的特殊情况，提高警觉，准备应变措施的标线 B:告知道路交通的通行、禁止、限制等特殊规定，车辆驾驶人及行人必须遵守的标线 C:指示车行道、行驶方向、路面边缘、停车位等的标线 D:车行道边缘线

关于投影的指示，下列说法正确的是 （）

A:可以用指示棒指示银幕 B:可以用手指示银幕 C:可以用指示棒指示投影片 D:可以用手指示投影片

用万用表测 15mA的直流电流，应选用(　)电流挡。

A:10mA B:25mA C:50mA；