电力系统中的五防操作过程中，钥匙插入某个机械锁后，提示正确请

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问题单项选择题

电力系统中的五防操作过程中，钥匙插入某个机械锁后，提示正确请操作时，钥匙就自动关机了，是（）导致的。

A、锁码错误

B、走错间隔

C、钥匙电池故障

D、温度太低

答案

参考答案：C

填空题

根据句意填单词，使句子完整、通顺。

1. The second day of a week is__________

2. Her favorite ___________is baseball.

3. The students have classes five days a week, from Monday to_____________

4. "What color do you like best?" means "What is your____________ color?"

5. Mrs. Liu is their Chinese___________.She teaches them Chinese.

6. Science is very interesting, ___________ difficult.

7. She often___________her homework at school.

8. I like playing___________my friends.

9. —The TV show is_______

—Let's go to the movies.

10. —What ___________is it today?

—It's Friday.

单项选择题

系统的功能不等于要素功能的简单相加，而是往往要大于各个部分功能的总和，这是系统的（）表现。

A.动态性

B.层次性

C.开放性

D.整体性