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Put the adverbials into the correct groups.How?1.2.3.4.5.6.

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Put the adverbials into the correct groups.When? / How often?1.2.3.4.5.6.

Put the adverbials into the correct groups.Where?1.2.3.4.5.6.

Put the adverbials into the correct groups.How likely?1.2.3.4.5.6.

纯电阻交流电路，电路的功率因数 cos φ为（）。

A. 1
B. 0
C. 100
D. 90