Upon the survey it is found the deck control valve of the fore peak lank could not be _______.
A.tightened formally
B.shut tightly
C.combined properly
D.closed suitably
正确答案是B
Upon the survey it is found the deck control valve of the fore peak lank could not be _______.
A.tightened formally
B.shut tightly
C.combined properly
D.closed suitably
正确答案是B