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一、填空题(共30分,每小题2分) 1.填写下列物理量所对应的国际单位: A.质量__.B.压强__. C.密度__.D.电量.__. 2.直流发电机的原理与交流发电机的原理很相似,它用__来代替交流发电机上的两个__。这样,虽然线圈中产生的是__,而供给外部电路的却是__。 3.将下列现象所对应的物态变化类型填入空白处:秋天草叶上挂着的露珠是__;冬天的早晨常常看到的霜是__.
First, fill in the blank (a total of 30 points, 2 points for each question) 1. Fill in the following physical quantities corresponding to the international unit: A. Quality __.B. Pressure __. C. Density __.D. Electricity. __. 2. The principle of a DC generator is very similar to that of an alternator. It uses __ instead of two __ on an alternator. In this way, although the __ is generated in the coil, the __ is supplied to the external circuit. 3. Fill in the blanks with the types of changes in the following phenomena: The dewdrops on autumn leaves are __; the frosts often seen on winter mornings are __.