整修、更换和补充连接零件、并有计划的涂油属于（）的作业范围。 A.大修作业 B.综合

Winters in ______ north of China are for_____ most part dry and cold.

A．不填; a

B．the; 不填

C．不填; 不填

D．the; the

Everyone must be responsible for their own behavior, and most of the young people today are interested, as far as I can perceive, in taking their knocks, just as adults must take theirs.

A．taking their jobs

B．sharing their ideas

C．assuming their responsibilities

D．shaking off their responsibilities

关于聚丙烯酸叙述不正确的是（）

A.易溶于水、乙醇、甲醇和乙二醇等极性溶剂。

B.其聚合反应一般在50-100℃的乙醇中进行。

C.溶解度越高，粘度也越大。

D.聚丙烯酸可以被氢氧化钠中和。

法兰连接应保持同一轴线，其螺孔中心偏差不宜超过孔径的（）%，并应保证螺栓自由穿入。

A、5

B、8

C、10

D、11

微型机由什么组成？