液压系统中,实现工作机构的顺序动作可采用()控制、()控制和()控制等方法。
参考答案:压力;行程;时间
Who did the teacher, as well as the monitor, ____ an article for the wall newspaper?
A.has write
B.has written
C.have write
D.have written
当门窗与墙体固定时,应( )。
A.先固定边框,后固定上框
B.先固定边框,后固定下框
C.先固定上框,后固定边框
D.先固定下框,后固定边框