问题
单项选择题
电压质量取决于系统中无功功率的（），无功不足，电压将偏低。
A.增加；
B.减少；
C.变化；
D.平衡。
答案
参考答案：D
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电压质量取决于系统中无功功率的（），无功不足，电压将偏低。
A.增加；
B.减少；
C.变化；
D.平衡。
参考答案：D
用所给单词的正确形式填空：
| |
| Lily: Good afternoon, Han De. I'm (1) _______ you could come to our Thanks-giving dinner. Han De: Thanks for (2)_______me. Why do you call it dinner when we are eating (3)_______noon? Lily: Because it's a big (4)_______. We call it dinner when we have a lot to (5)_______. Han De: Is that a chicken? It's (6)_______ big! Lily: No, it's a (7)_______. Han De: Why do America and Canada (8)_______ Thanksgiving Day? Lily: It's like your Mid-Autumn Festival. In China, (9)_______get together and celebrate the bright, round moon. In America and Canada, families get together to celebrate the harvest (丰收). Han De: So we (10)_______have an autumn festival. Lily: Yes, and we each celebrate with our families. |