“船员日常防火守则”应是()。
A.全体船员遵守
B.高级船员遵守
C.普通船员遵守
D.轮机部船员遵守
参考答案:A
I was about to go to bed _____ one of my old classmates made a call to me.
A.when
B.as
C.while
D.that
什么是压力容器的二次爆炸?