风是指冷暖气团的交界面，当冷锋过境时（）。
A.气压升高风力增大
B.气压降低风力增大
C.气压升高风速不变
D.气压降低风速不变
参考答案：A
用适当的词填空。
1. Please write _____ the new words on the blackboard.
2. How _____ milk do we have at home?
3. —_____ are you today?
—Fine, thanks.
4. The watch is very nice. _____ you like it?
5. —What’s the _____, please?
—It’s four.
6. It’s time _____ play games. Let’s go, Tom.
7. —What’s _____ you like to have?
—A glass of milk.
HXD3电力机车辅助压缩机打风时间若超过10min，需人为断开自动开关，间隔（）再投入使用。
A、10min
B、20min
C、30min
D、40min
