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问题 判断题

Excel中，公式总是以等号“＝”开始，以运算体结束，相邻的两个运算体之间必须使用“、”或“；”进行连接。

答案

参考答案：错

计算题

如图，带电平行板长为L，距离为d将电子（质量为m、电量为-e）在两板中央以速度v0垂直电场方向射入，飞出电场时侧位移为d。则：

（1）电子在电场中运动的时间为多少，此时所加的偏转电压多大；

（2）进入电场的初速度不变，若使电子不能射出电场，偏转电压应满足的条件。

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填空题
用方框内单词的适当形式填空
sleep ; look ; have ; skate ; notice ; hungry ; golden ; be
1. The children _____ all at school yesterday.
2. My brother enjoys _____ in winter.
3. The Greens _____ a big dinner at a restaurant yesterday.
4. Tom was tired and was soon _____.
5. You must _____ after the twins because they are too young.
6. I _____ a beautiful flower in the garden yesterday.
7. I was very _____ because I didn't have breakfast this morning.
8. My father bought a _____ watch for my mother as a birthday present.
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