A . to revolve
B . revolved
C . revolving
D . to be revolved
[单选题]The piston moves up and down, thus causing the rotational movement of the()A . crankshaftB . connecting rodC . cross-headD . main beating
[单选题]The energy for pushing this piston up can be supplied from (), so that the piston can keep moving up and down.A . the same pistonB . the piston nearbyC . the other pistonsD . the generators on board
[单选题][A] up [B] off [C] down [D] on
[单选题]设置主接口由Up转Down后延迟30秒切换到备份接口,主接口由Down转Up后60秒钟切换回主接口的配置为()A .backup 3060B .backup delay3060C .backup delay6030D .backup delay enable-delay 30 disable-delay 60
[单选题]Shall we sit up here on the grass or down there near the water?_________。A.
[多选题] 下面当主接口由up转为down后哪种说法正确?()A .当主接口由up转为down后,立即切换到备份接口。B .当主接口由down转为up后,立即切换回主接口。C .当主接口由up转为down后,等待一定时间后,若主接口状态仍为down,才切换到备份接口。D .当主接口由down转为up后,等待一定时间后,若主接口状态仍为up,才切换回主接口。
[单选题]Shall we sit up here on the grass or down there near the water? ________A.I
[单选题]—Shall we sit up here under the tree or down there near the water?— ____A.I
[单选题]Paul couldn't sleep last night. He woke up early and sat up, and then he la
[单选题]Paul couldn't sleep last night. He woke up early and sat up, and then he la