题目内容

Onchart,bearingstonearobjectsshouldbeusedinpreferencetoobjectsfartheroff,because().

A. asmallerrorinbearingorinlayingitdownonthecharthasagreatereffectinmisplacingthepositionthelongerthelinetobedrawn
B. allscalesarekeptupdatedforvitalinformationbyNoticestoMariners
C. thelargerthescaleofthechart,thegreaterthedetailthatcanbeshownonit
D. themarinerusingthemediumscalechartsforpassagealongacoastneednottransferontoalargescaleforshortdistances

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一家公司研究出产品配方后没去申请专利,而将配方交给总经理和工程师各持一部分保留,这种做法属于专有技术的哪一特征()。

A. 经济性
B. 可传授性
C. 保密性
D. 历史性

Crankcaseexplosionsinpropulsiondieselresultfrom()

A. thesplashingoflubricationoilbythecrankshaft
B. thedilutionofcrankcaseoilwithparticlesofcombustion
C. brokenfuellinessprayingoilonthecrankcase
D. theignitionofunburnedfuelandairinthecrankcase

下列哪一种情况下,C02最可能成为限制光合作用速率的主要因子()

A. 处于光补偿点
B. 处于光饱和点
C. 处于C0补偿点
D. 处于C0饱和点

Combustionknockoccurringinadieselenginecanbecausedby()

A. lowcoolanttemperature
B. insufficientfuel
C. highambienttemperature
D. carbonbuildupontheinjectortips

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