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问题:

[单选] An instrument that maintains a continuous record of humidity changes is called a().

A . thermometer
B . barometer
C . hygrograph
D . thermograph

下列四国为世界主要国家。 有关四国的地理特征,叙述不正确的是() 甲国被誉为“骑在羊背上的国家”。 乙国是世界最大的农产品出口国。 丙国的北部海域有世界著名的渔场。 丁国位于欧洲大陆上的“十字路口&rdquo。 An intermediate spring is(). fitted in each leg of the towing bridle。 generally located between the "fishplate" and the main towing hawser。 secured at the "H" bitts。 usually made of manila hawser。 The closed-loop system differs from the open-loop system by() the lack of a feedback。 the presence of a feed back。 the lack of a computer。 the presence of a computer。 From the passage, we can learn that the simplest controller action is() two-step controller action。 proportional, controller action。 integral controller action。 derivative controller actio。 下列属于流量的是()。 A.出口量。 B.进口量。 C.储蓄量。 D.投资量。 An instrument that maintains a continuous record of humidity changes is called a().
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