航海英語(yǔ)各種英文申請(qǐng)書單項(xiàng)選擇題每日一練(2019.07.27)

來源：考試資料網(wǎng)

1 An obstruction on a helodeck is any object that might present a hazard to the（）.

2 A drilling bit which is doughnut shaped to permit recovery of the center portion of the hole drilled is called a（）.

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3 A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.

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4 Permanent magnetism is caused by（）.

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5 PLS BE INFORMED THAT SUB VSL’S TWO KINDS OF CERTIFICATES HAVE EXPIRED. ONE IS DERATING CERTIFICATE AND THE OTHER IS SAFETY EQUIPMENT CERITFICATE. According to this telex,（）.

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