單項選擇題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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1.單項選擇題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
2.單項選擇題The diameter of the crank-pins should be measured with a （）.
A.salinometer
B.thermometer
C.tachometer
D.micrometer
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