题目内容

Howarerivetedlapjointsmadewatertight?()

A. Thefayingsurfacesarecoatedwithwhitelead(orsimilarproduct)beforetherivetsareset
B. Asealingweldbeadof1/8orlesspitchisrunalongtheplateedge
C. Theplateedgeissplitclosetoanadjacentplateandmechanicallyforcedintocontactwiththeadjacentplate
D. Aproperlyrivetedjointwillbewatertight;anyleakageisstoppedbysettingupontherivets

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如右图所示,为人体内氢随化合物在生物体内代谢转移的过程,下列分析不合理的是()

A. ①过程发生在核糖体中,水中的氢只来自于—NH
B. 在缺氧的情况下,③过程中不会发生脱氢反应
C. M物质应该是丙酮酸,④过程不会发生在线粒体中
D. 在氧气充足的情况下,②③过程发生于线粒体中

IfyourvesselhasaGMofonefootandabreadthof50feet,whatwillbeyourfullrollingperiod?()

A. 11seconds
B. 15seconds
C. 20seconds
D. 22seconds

下列哪项属于“6841汇划来账凭证连续打印”交易,必须录入/选择的内容()。

A. 单证种类
B. 凭证种类
C. 凭证起始号码
D. 凭证截止号码

Onemethodofcontrollingratsonvesselsisbyrat-proofing.Rat-proofingisaccomplishedby().

A. installingratguardsonthemooringlineswheninport
B. keepingfoodsprotectedandavoidingtheaccumulationofgarbage
C. eliminatingpossiblelivingspacesforratswhentheshipisconstructed
D. trappingand/orpoisoningtherats

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