电液阀阀门渗漏的常见原因有（）。
A.手动开阀球阀没关严
B.膜片损坏
C.常闭阀关闭不严
D.主阀O型密封圈损坏
参考答案：A, B, C, D
根据句意及首字母或汉语提示完成单词。
1. I don't like summer, because it's too h_____.
2. There are lots of beautiful b_____ in Hainan Island.
3. —How is the w_____ today?—It's cloudy.
4. _____ (冬天) comes, can spring be far behind?
5. We are _____ (惊奇的) to meet an old friend on the street.
哮喘重度发作时的血气变化为
A．pH↑，PaO2↓
B．PaO2↓，PaCO2↑
C．pH↑，PaO2↓
D．pH↑，PaCO2↓
E．pH↓，BE↓
