黑舱原理是指（）。
A.在正常情况下，驾驶舱没有灯被点亮
B.驾驶舱没有安装指示灯
C.当故障时，所有灯都灭
D.没有安装照明灯
参考答案：A
根据中文提示，用词组的适当形式填空。每空一词。
1. She is going to be a dancer when she ________ ________(长大).
2. The radio is too noisy. Could you ________ it _______(调低)?
3. Tom ________ ________(到达) Shanghai on the morning of August lst.
4. The flood (洪灾) ________ ________ (突然发生) in my hometown in 1998.
5. Let's stay at home watching TV ________ ________ (代替) going to the concert.
炼油厂工艺加热炉的选用原则是什么？
