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

單項選擇題

During severe storms when survival becomes a major concern,it may become necessary to relieve high anchor tensions on the windward side of the unit by().

A.deballasting the rig
B.ballasting the rig
C.paying out cable on the windward side
D.paying out cable on the leeward side

微信掃碼免費搜題