无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<ins id="uzhth"></ins>

單項選擇題

The three basic parts of any eductor are the nozzle, the suction chamber, and the （）.

A.injector
B.compressor
C.diffuser
D.siphon

你可能感興趣的試題

單項選擇題

（）, the engine must be stopped immediately.

A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking

單項選擇題

Grind the （）.

A.keyway
B.shaft
C.packing
D.valve