航海英語(yǔ)各種英文申請(qǐng)書單項(xiàng)選擇題每日一練(2019.07.31)

來源：考試資料網(wǎng)

1 A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.

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2 A disadvantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it is （）.

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3 A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.

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4 All ships（）suspected infectious disease on board should radio information to Port Health Officer.

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5 Your vessel has completed an inspection for certification and is issued a Temporary Certificate of Inspection. The Temporary Certificate（）.

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