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

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Setting a sealing equipment astern on the tailshaft can’t ____.

A.prevent the seawater from intergrating

B.prevent the lube oil from running out of the outside aboard

C.strengthen the intencity of the sterntube

D.prevent the mud and sand from entering the lube oil system

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热搜:a是b的充分条件,b是a的必要条件吗