硬聚氯乙烯风管和法兰连接,应采用()或增强尼龙螺栓,螺栓与法兰接触处应加镀锌垫圈。
A.镀锌螺栓
B.普通碳素钢螺栓
C.不锈钢螺栓
D.地脚螺栓
参考答案:A
The criminals ______ in a hotel the other day were connected with a murder(谋杀).
A.arrested
B.to be arrested
C.being arrested
D.arresting
用来描述和说明工质状况的一些物理量称为工质的()