单项选择题
A.a micrometer B.a bridge gauge C.a spanner D.a wrench
The diameter of the gravity disc is too big It causes o...
单项选择题The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
A.water B.oil C.scale D.ridge
The diameter of the crank-pins should be measured with ...
单项选择题The diameter of the crank-pins should be measured with a （）.
A.salinometer B.thermometer C.tachometer D.micrometer
The development of （） has kept pace with the increasing...
单项选择题The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.
A.water B.fresh air C.oils D.gases
