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温差作用

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流纹岩属于哪类岩石()。

A. 酸性岩
B. 中性岩
C. 基性岩
D. 超基性岩

政府税收增加将使总需求曲线向右方移动。

A. 正确
B. 错误

主导的电信业务经营者由()主管部门确定。

The damage to a vessel is over $25,000. Who must notify the nearest Coast Guard Marine Safety or Marine Inspection Office as soon as possible?()

A. The Master of the vessel
B. The Radio Officer
C. The Chief Officer
D. All of the above

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