( )should be taken out before a passenger passes through thewalk-through metal detector.

多选题

( )should be taken out before a passenger passes through thewalk-through metal detector.

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问答题

be taken care

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填空题

Care should be taken to decrease the length of time that one is subjected（ ）loud continuous noise.to

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单选题

When an incinerator goes out suddenly, the ____ supply should be shut off quickly

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单选题

Two vessels are approaching each other near head on. What action should be taken to avoid collision?A. The first vessel to sight the other should give wayB. The vessel making the slower speed should give wayC. Both vessels should alter course to starboardD. Both vessels should alter course to port

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