一个网络计划（ ）
A．有时可有多条关键线路
B．只有一条关键线路
C．有时没有关键线路
D．关键线路是不可改变的
参考答案：A
按要求完成句子.(10%)
1. Frank is running. (改为一般疑问句)
____ frank ____?
2. Her father is watching TV. (用at night 改写)
Her father _____ _____ at night.
3. Betty usually does her homework after school. (变为否定句)
Betty usually _____ _____ _____ homework after school.
4.What does your aunt do? (改为同义句)
____ ____ your aunt?
5. Susan is talking with her friends. (就画线部分提问)
____ ____ Susan ____?
下列选项中，不属于模块间耦合的是
A) 数据耦合 B) 标记耦合 C) 异构耦合 D) 公共耦合
