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

單項(xiàng)選擇題

The () is used to measure the volume of a liquid or gas through a pipeline within any given period of time.

A.flowmeter
B.viscometer
C.micrometer
D.feeler

微信掃碼免費(fèi)搜題