选择螺栓材料应比螺母()
A.高一个工作等级的钢种
B.选择一样
C.低一个工作等级的钢种
D.不做要求
参考答案:A
Though it was noisy here,he reading. [ ]
A.got on
B.carried out
C.went on with
D.carried on
发病的重要条件是()
A.正气不足
B.邪盛而正未衰
C.邪气
D.正气与邪气的斗争
E.正衰邪盛