图中所示窗体的视图方式是( ) [*]
A.设计视图 B.窗体视图 C.数据表视图 D.数据图视图
参考答案:B
We were told not to touch the equipment in the laboratory unless ________. [ ]
A. allowed to do
B. allowing to do
C. allowed to
D. allowing to
油压泵启动时,控制油温的目的是()。
A、保护油压泵
B、保护油压缸
C、保护旋转阀
D、防止液压油发生低压力报警