单项选择题

农事号子主要指车水和打粮、碾米等劳动中唱的号子
A. 对

B. 错

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单项选择题

But __________ if I lived on the border to Mexico, I would be able to speak English and Spanish, too. A.

maybe B.

always C.

never D.

certainly

变频器容量较大时，可为其单独配置供电变压器，以防止电网对变频器的干扰。
正确
错误

答案：正确