题目内容

Whenpreparingashipforheavyweather,fueloildaytanksshouldbe().

A. pumpedoverboardtocalmtheseas
B. drainedtothelowerhulltoreducefreesurfaces
C. filledtoensurethatsufficientfueloilisavailableduringalengthyemergency
D. partiallydrainedtoincreasefreesurfacesinordertoreducemotions

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Whichisthepollutionpreventionequipment?()

A. boosterpump
B. evaporator
C. incinerator
D. cooler

下图曲线a、b表示两类生物存活率(纵坐标)与种群密度(横坐标)之间的关系,下列分析错误的是()

A. 曲线a代表的种群个体一般体型较大,营养级较高
B. 依据曲线b,人工养蜂时种群密度中等最好
C. 对大型动物迁地保护,迁移的种群密度不宜过大
D. 种群密度为d时,曲线b代表的种群个体间竞争最剧烈

哪种装置属于自备发电机组降噪设备()

A. 消音器
B. 消音板
C. 机组导风罩
D. 隔音门

Whentheperiodofbeamseasequalsthenaturalrollingperiodofavessel,whatwillmostlikelyoccur?()

A. Excessivepitching
B. Excessiveyawing
C. Excessiverolling
D. Nochangeshouldbeevident

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