以下选项中，不能作为合法常量的是A) 1.234e04 B) 1.234e0.4 C

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问题单项选择题

以下选项中，不能作为合法常量的是

A) 1.234e04
B) 1.234e0.4
C) 1.234e+4
D) 1.234e0

答案

参考答案：B

解析： C语言的语法规定，字母e(E)之前必须有数字，且e(E)后面的指数必须是整数，而选项B)中，e(E)后面的指数是小数，所以不合法。

填空题

用所给词的适当形式填空

1. My sister always_______(learn) language very quickly, but she isn't able to learm Greek.

2. When our teacher______( come) into the room, we were talking.

3. I ________ ( be ) sixteen years old next year.

4. Jim and Kate______( marry) for 10 years.

5. The American friends_______( visit ) Beijing last spring.

6. By ten o'clock yesterday evening, they______( watch)TV for 12 hours.

7. Our teacher hoped that we______(succeed) some day .

8. The students _______( make) great progress in their spoken and writing English in the

last two months.

9. My friend______( work) here since he graduated fromthe college.

10. Lily told me not to give up ______ ( study) English.

问答题简答题

请简述什么是跨步电势、跨步电压。