为防止吊钩意外脱钩，吊钩宜设有防脱钩安全装置。（）
A、正确
B、错误
参考答案：A
叙述旋转风阀的主要构造。
The weather is fine today. ______ yesterday.
A．Neither was it
B．Neither it was
C．So was it
D．So it was
