吊笼上最高一对安全钩应处于最低驱动齿轮之上。
参考答案:错
We were all very much attracted by the beautiful scenery________we set foot in the village.[ ]
A.quickly
B.suddenly
C.finally
D.immediately
双相Ⅰ型障碍是指()
A.既有躁狂发作又有重型抑郁发作
B.有轻躁狂发作,无躁狂发作
C.只有重型抑郁发作
D.诊断较为困难
E.急性期可单用抗抑郁药物