各皮带机的启动间隔至少为上级皮带启动电流回落到正常电流后（）。
参考答案：4-6秒
—_________ you _________ the terrible news about Libya?
—Yes, I _________ it this morning. The people there will suffer from the war.
A．Do, watch; have done
B．Did, watch; did
C．Have, watched; did
D．Had, watched; will do
护士为患者进行查体时应使用的距离是( )
A．亲密距离B．个人距离C．工作距离D．公众距离E．社会距离
