运转正常的离心泵突然产生噪音和振动可能是由于产生汽蚀或气缚现象。（）
参考答案：对
Jake _____his key in the office so he had to wait until his wife _______ home.
A．has forgotten … comes
B．forgot… come
C．had left… came
D．had left…would come
三元乙丙橡胶防水卷材不适宜屋面工程单层外露防水，只适用于有保护层的屋面及室内楼地面、厨房、厕浴间、地下室、储水池和隧道等工程防水。( )
