单项选择题
The knot used to join two lines of different diameter is a（）.
A.square knot
B.carrick bend
C.becket bend
D.sheepshank
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单项选择题
The knot at the end of the heaving line used to pass the towing hawser is called a（）.
A.monkey's fist
B.ball or baseball knot
C.heaving knot
D.three strand Turk's head -
单项选择题
he heel block is located（）.
A.at the base of the boom
B.at the cargo hook
C.near the midships guy
D.near the spider band -
单项选择题
The disadvantage of using three strand nylon line for towing is its（）.
A.inherent weakness
B.tendency to rot if left damp
C.danger to crew if it parts
D.strength and shock absorbing abilities
