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含铜盐蛋白沉淀剂

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位于子宫下接与暴露阴道的部分称为

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高压供电的用电单位，功率因数为0.9以上。()

A. 正确
B. 错误

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需要两回电源线路的用电单位，可根据各级负荷的不同需要及地区供电条件，采用不同电压供电。()

A. 正确
B. 错误

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Which of the following statements is true？

A. It was never difficult for Beethoven to compose music.
Beethoven didn't have any hearing problems until he was 28.
C. His best music was written long before he became deaf.
D. Beethoven was satisfied with his composition.

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