99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<ruby id="ny5mm"><xmp id="ny5mm"></xmp></ruby>

<ruby id="ny5mm"><small id="ny5mm"></small></ruby>

單項選擇題

To prevent the riser system from buckling under its own weight，upward tension is provided by the（）.

A.riser stabilizers
B.guideline tensioning system
C.riser tensioning system
D.guideline stabilizers

你可能感興趣的試題

單項選擇題

To（）sanitary water from any vessel，an application shall be made to Harbor Authorities for approval.

A.discharge
B.recircle
C.load
D.take in

單項選擇題

These weights are（）the ship’s discharging facilities．

A.out
B.beyond
C.from
D.off

<dl id="rjrkq"></dl>