单项选择题
The diameters of the crankpins should be measured using （）.
A.a micrometer
B.a bridge gauge
C.a spanner
D.a wrench
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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 -
单项选择题
The diameter of the crank-pins should be measured with a （）.
A.salinometer
B.thermometer
C.tachometer
D.micrometer -
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
