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The purpose of the wearing rings used in a centrifugal pump is to _____.A.prevent an inter

The main function of piston compression rings is to _______.A.prevent excessive cylinder l

Setting a sealing equipment astern on the tailshaft can’t ____.A.prevent the seawater from

According to the news item, partially hydrogenated oils are used to______.A．prevent heart

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_________(60)A.begin B.like C.decide D.have