油泵应每（）检查校验一次真空表及压力表。
A.月
B.季
C.半年
参考答案：C
Excuse me, but could you tell me _______?
A．what is your name
B．how I can call this young lady
C．what is the matter with you
D．how long the dog has died
优质干白和新鲜葡萄酒特征.
