雷雨天气，轨道吊司机跑大车时应仔细观察（）情况，防止盖板上浮移位，造成安全隐患。
A、防风插板
B、电缆井盖板
C、防风楔
D、防撞限位
参考答案：B
—When did you find your pocket ________?
—It was when I was going to work by bus.[ ]
A. to pick
B. to be picked
C. picked
D. picking
水泵启动前检查各连接部位应无松动，盘动联轴器看是否灵活，泵内是否（）
A.异响
B.灵活
C.有水
D.完好
