i-drop是一种拖放方法，可以提供以下功能（）。

A:选择i-drop内容的类型 B:指定下载的关联数据文件 C:查看i-drop内容的日志文件 D:把图形文件从网页拖动到图形区域中

下列（）语句用于创建触发器。

A:CREATE PROCEDURE B:CREATE TRIGGER C:ALTER TRIGGER D:DROP TRIGGER

下列（）语句用于删除触发器。

A:CREATE PROCEDURE B:CREATE TRIGGER C:ALTER TRIGGER D:DROP TRIGGER

SQL Server2005中，如果要删除一个存储过程，则可以使用（）语句。

A:create procedure B:drop database C:drop procedure D:drop trigger

下列关于软切换去门限参数T_DROP的相关描述，正确的有（）。

A:当激活集或候选集的导频强度降至T_DROP以下，移动台将为该导频开启切换去掉定时器 B:如果T_DROP设置过高，则可能会导致有用导频被迅速从激活集剔除，从有用信号变成干扰，从而导致掉话 C:如果T_DROP设置过低，则可能会导致过多的软切换，从而影响前向链路的容量 D:在设置T_DROP时必须考虑T_TDROP的设置，因为前者相对于T_ADD而言是功率迟滞，而后者引入的是时间迟滞

The safety of mobile phones (U. S. cell-phones) seems to face new questions after British researchers found that microwave emissions can affect the health of earthworms in unexplained ways.
The larvae of tiny soil worms called nematodes grew faster and became more (1) after they were (2) for a long time to weak microwave radiation, of the (3) strength and frequency as that (4) by mobile phones, they found.
Why this occurred is (5) , and there is no evidence that human health is also affected. But, they warn, the finding challenges the standards which (6) whether a mobile is safe or not.
These standards are based on whether the radiation is strong enough to cause a batch of (7) to warm up. Heat causes the chemical bonds in cells to (8) , a disruption that can be a potential (9) for cancer.
The research, led by David de Pomerai at Nottingham University, central England, said larvae exposed to the microwaves (10) between eight and eleven percent faster than (11) which had not been exposed.
In addition, the (12) of worms that (13) into egg-bearing adults was 28～40 percent higher.
By comparison, worms that had been exposed to (14) heat suffered a 10-percent reduction in their growth rate, and (15) none developed into fertile adults.
The experiment is important because it suggests that microwaves might trigger biological effects. (16) warming any tissues.
The scientists do not (17) out the possibility that radiation could cause hot-.spots to occur somewhere in the worm that then affected cell (18) .
The worry, though, is that the 19 basis for determining mobile safety is whether microwaves cause heating in bulk tissue rather than just at (20) in it, they note.

A:inspiration B:spur C:push D:trigger

As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. High-fat diets and "life in the fast track" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising.
Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 AM and 10:00 AM.
In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered.

A:We now fully understand how risk factors trigger heart attacks. B:We recently began to study how risk factors trigger heart attacks. C:We have not identified many risk factors associated with heart attacks. D:We do not fully understand how risk factors trigger heart attacks.

删除触发器tri_Sno的正确命令是______。

A:REMOVE TRIGGER tri_Sno B:DROP TRIGGER tri_Sno C:TRUNCATE TRIGGER tri_Sno D:DELETE TRIGGER tri_Sno