对常规故障，在动手拆卸和测试之前，尽可能（）故障原因的设定范围
A.扩大
B.缩小
C.保持
参考答案：B
I didn’t know his address yesterday, otherwise I __________ him a visit.
A．would pay
B．would have paid
C．paid
D．had paid
液体检样单位报告为（）。
A.m3
B.g
C.cm3
D.ml E.cm
