Which change in the condition of the seas could indicate the formation of a tropical storm or hurricane several hundred miles from your location? （）

A、A.A long swell from an unusual direction

B、B.A lengthy lull in the wind and seas

C、C.Large seas coming from different directions

D、D.A brisk chop from the southeast

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第1题

[单选题] Which of the following statements is correct regarding an oil with a high viscosity index?（）

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第2题

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A、A.at which/to which B、B.from which/at which C、C.to which/from which D、D.in which/on which

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第3题

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第4题

[单选题] The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.

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第5题

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第6题

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第7题

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