装载压缩气体的车辆停放有何规定？
参考答案：
装载压缩气体的车辆必须停放在固定线路上，两端道岔应扳向不能进入的位置并加锁。
— Don't worry; I am sure the doctor will be here in time.
— But what if he _____? It's going to rain and it's getting dark. [ ]
A. won't come
B. isn't coming
C. doesn't come
D. wouldn't come
皇帝每年春天到先农坛祭祀，要在中和殿做什么？
