问题 单项选择题

Bitmap索引提高下面哪种情况的性能。()

A.在查询一个有50000条记录表的表列,该表列值只有四个不同的值时

B.当被索引的列值更改时

C.当每次仅删除一或两条记录时

D.当一次插入上百条记录时

答案

参考答案:A

单项选择题

Everyone gets angry sometimes, but being angry doesn’t really solve much. Your goal is to calm yourself down. This is (1) for some people. Instead of calming down, they might get more and more upset (2) they explode like a volcano. Some people might say they have trouble (3) their temper. Sometimes angry feelings can be hard to (4) . So what do you do if your temper is like a volcano

Well, the good news is (5) people don’t keep making the same mistakes over and over again. You can train your temper. Here are steps you can (6) at any time.

Get a lot of (7) activity. Exercise can be good because it is a way of (8) energy and stress. You can dance around your room (9) your favorite music, too.

Talk to your mom or dad. If you’re having trouble with your temper, tell your parents you’re trying to do a (10) job of controlling yourself. Let them know you are going to ask for their help.

Put (11) into words. Get into the habit of saying what you are feeling and why. (12) using words might help you manage your p feelings and behaviors.

Take a break from the (13) . If you are in an argument with someone, go to another part of your house. You can just say, "I want to be (14) for a while so I can calm down. "

Go into a (15) . If you fed angry and think you need a timeout to calm down, don’t (16) your parents to tell you to take a timeout for yourself. Let your family know that when you’re taking a timeout, they need to (17) your space and leave you alone. While you are sitting in your chair, try to take deep (18) .

Learn to shift. The idea is to shift from a really angry mood to a better mood. After you (19) the angry feelings out, you have to start thinking about other things, You can say, "I (20) my temper, but I’m going to get myself under control now.

14()

A.lonely 

B.alone 

C.friendless 

D.distant

多项选择题