航海英語船舶索具名稱單項選擇題每日一練(2019.01.16)

來源：考試資料網(wǎng)

1 A tackle by which the outer end of a boom is raised and lowered is the topping（）.

2 Cribbing is（）.

3 The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.

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4 The purpose of a devil’s claw is to（）.

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

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