There was a 0.3 per cent rise in the c

1、There was a knock at the door. It was

There was a knock at the door. It was the second time someone （）(打扰我) that evening.

2、Pitting in the suction areas of a cent

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.AcavitationBelectrolysisCabrasionDcorrosio

3、A virtual rise in the center of gravit

A virtual rise in the center of gravity may be caused by（）.Afilling a partially filled tankBusing an on board crane to lift a freely swinging heavy objectCemptying a partially filled tankDtransferring ballast from the forepeak to the after peak

4、How did the host find out there was a

How did the host find out there was a thief in the house?A He heard someone breathing.B He heard footsteps in the hall.C He noticed a shadow on the floor.D He noticed that his gifts were gone.

5、)7．—Was there a nice picture on the wa

)7．—Was there a nice picture on the wall?—＿＿＿＿＿＿．A No，there wasntB No，there werentC No，there isn tD No，there arent

6、If water is rising in the bilge of a l

If water is rising in the bilge of a lifeboat，you should FIRST（）.Aabandon the survival craftBcheck for cracks in the hullCshift all personnel to the sternDcheck the bilge drain plug