活塞式压缩机十字头与滑板装配时,十字头的中心线允许比滑道中心线低()mm。
A、0.05~0.10
B、0.12~0.15
C、0.15~0.18
D、0.18~0.20
参考答案:A
Jobs are hard to get and, _______, more young people are continuing their education.
A.above all
B.as a result
C.on the contrary
D.after all
教学目的能否达到,教学任务能否完成,取决于教师教学的努力程度。( )