单项选择题
The distance that a ship moves forward with each revolutionof its propeller，if there is no slip，is called（）.
A.advance B.head reach C.pitch D.transfer
单项选择题 The distance between rivets in a row is known as the（）.
单项选择题 The BEST way to steer a twin-screw vessel if you lose your rudder is by using（）.
单项选择题 The area around Cape Charles is（）.
