题目内容

Thepistoncoolingsystemmayemploysimilarcomponents,exceptthatadraintankisusedinsteadofaheadtankThatmeansthissystem().

A. doesntuseadraintankbutaheadtank
B. usesadraintanknotheadtank
C. usesadraintankandaheadtank
D. usesneitheradraintanknoraheadtank

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Amarinechemistissuesgasfreecertificatesandiscertifiedbywhichorganization?()

A. MineSafetyApplianceAssociation
B. AmericanChemicalSociety
C. MarineChemistsAssociation
D. NationalFireProtectionAssociation

Amessagebyflashinglightconsistsofthecall,theidentity,thetext,andthe().

A. destination
B. answer
C. time
D. ending

随着庄园制的逐渐瓦解,室町幕府的土地所有制、阶级关系也发生了变化。镰仓时期的那种御家人的主从关系发生变化,()成为了统治层的实力派。

A. 将军
B. 天皇
C. 守护大名
D. 武士

Theplungerinthefuelinjectorpump,usuallyoperatedbya(),isdrivenupanddownwhenworking.

A. crankshaft
B. camshaft
C. pistonrod
D. rackandpinion

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