切纸刀具外径过大或过小在使用中会造成()。
参考答案:跳刀
下面有关限速器说法正确的是:()
A.应标明与安全钳动作相应的旋转方向
B.应是可接近的,以便于检查和维修
C.限速器动作之前(或同时)有一个电气安全装置使电梯主机停止运转
D.应有一电气安全装置验证限速器复位
Many of us have a strange sense that we do remember feeling as if we _________in a dream, but can’t quite recall the details.
A.are flying
B.were flying
C.fly
D.would fly