During the voyage the ship encountered ______ winds and weather，during which time she labored heavily and to such extent that at times it was necessary to change courses and reduce speeds in order to ease her and prevent damage to herself and her cargo．
A. large
B. big
C. boisterous
D. high
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What is the difference between net tonnage and gross tonnage ________．
A. Net tonnage is the gross tonnage less certain deductions for machinery and other areas
B. Net tonnage is tonnage of cargo compared to tonnage of whole ship
C. Net tonnage is the net weight of the ship
D. There is no difference
在()，创新活动的重点是技术开发。
A感性阶段
B概念化阶段
C研究开发阶段
D设计或试制阶段
()是善于组织、进行高效协调的能力，需要协调各方面的力量，化解矛盾，以形成整体合力。
A决断能力
B沟通能力
C组织协调能力
D实践操作能力
Please tell me ______ to reverse your engine from full ahead to full astern．
A. How length will it take
B. How long it will take
C. How long will it get
D. How much hours it will take
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