單項選擇題

Neglecting friction, you desire to life a 300 kgs weight with a stress on the hauling part of 100kgs.Which of the following tackles would you use ?（）.

A.Gun tackle
B.Luff tackle
C.Toe-fold tackle
D.Double-luff tackle

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單項選擇題

Never（）stowed like this.

A.optional cargo should be
B.should optional cargo be
C.should be optional cargo
D.should optional cargo

單項選擇題

0f the following, the most important consideration for a tank vessel is（）.

A.GM
B.the vertical center of gravity
C.the longitudinal center of gravity
D.the stress on the hull