單項(xiàng)選擇題The tailshaft sealing arrangement found a little lube oil leaky and caused a lot of seawater into the bearing, the step should be taken as a makeshift is（）

A.dropping lube oil for lubrication, reducing the pollution to the sea
B.setting a temporary gravity oil tank and enhanced the position properly
C.lubricating with the used lube oil
D.lubricating with the fresh water and navigation in a lower speed


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1.單項(xiàng)選擇題When the vessel shafting are installed, the slightly inclined of the shaft line should be rectified by（）

A.adjusting the position of the intermediate bearing
B.changing the position of the main engine installation
C.adjusting the center line of the propeller
D.changing the position of the thrust block

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題In the process of the shafting management, special attention should be paid to（）

A.on the sailing, the water in the aft peak tank should be excluded as much as possible
B.the stuffing style ahead sealing shouldn’t have any water leaking out
C.Simplex astern sealing shouldn’t have any oil leaking out
D.Simplex ahead sealing can have some oil leaking out

4.單項(xiàng)選擇題The main advantage of improved Simplex tailshaft seal are（）

A.the good sealing performance and the simple structure
B.the good sealing performance and the short life expectancy
C.the good sealing performance but the short life expectancy
D.the good sealing performance and the lower cost

5.單項(xiàng)選擇題Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）

A.the shafting’s vertical vibration
B.violent friction and sea water corrosive
C.friction and high temperature
D.violent friction and high temperature