在铝合金平顶中,为节约材料,靠墙龙骨可间隔设置。( )
参考答案:错
---- They say Philip’s brother is a billionaire.
---- ____________? He wouldn’t accept any help from his brother, even if it were offered.
A.What if
B.What for
C.So what
D.Forget it
油压装置的阀组里,减载阀的作用是()。
A、保证压力油罐内的油压不超过允许的最大压力,防止油泵与压力油罐过载
B、使油泵电动机能在低负荷时启动,减小启动电流
C、防止压力油罐的压力油在油泵停止运行时倒流