单项选择题
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
单项选择题 In the process of the shafting management, special attention should be paid to（）
单项选择题 The main advantage of improved Simplex tailshaft seal are（）
单项选择题 Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）
