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

<pre id="ylbps"></pre>

<blockquote id="ylbps"></blockquote>

單項選擇題

A Doppler speed log indicates speed through the water（）.

A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current

你可能感興趣的試題

單項選擇題

A disadvantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it is （）.

A.heavy
B.easily damaged
C.affected by temperature
D.costly relative to the strength ratio

單項選擇題

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.

A.stopper
B.screen
C.filter
D.restrictor

<dl id="bjj2m"><legend id="bjj2m"></legend></dl>

<pre id="bjj2m"><legend id="bjj2m"></legend></pre>