單項(xiàng)選擇題

Adjust （） by means of lead wire.

A.the clearance of the main bearing
B.the diameter of main bearing
C.the gap of main beating
D.the tolerance of main bearing

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單項(xiàng)選擇題

Additives （） protective layers on metal surfaces guarding them against corrosion.

A.damage
B.form
C.dissolve
D.contaminate

單項(xiàng)選擇題

Acid solution（） in the system can be tested from time to time by putting some on to a piece of lime.

A.strength
B.dense
C.percentage
D.velocity