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为什么交流电弧比直流电弧容易熄灭?

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为什么电动机要设有零电压和欠电压保护?

Complete the following dialogue.(从上到下,从左到右填写数字)A: Now we have settled the terms of payment. Is it possible to ______________ during September?B: I don’t think we can.A: Then when is the earliest we can ______________ ?B: By the middle of October, I think.A: It’s too late. You see, November is the season for these goods in our market.B: I understand.A: Thus, the goods must _________________, or we won’t be ready for market.B: I am very sorry to say that we cannot ___________________________.A: This is too bad, but I sincerely hope you will give our request your special consideration.B: All right. We’ll ______________ with our producers and see what they have to say.1.expect shipment2.be shipped before October3.get in touch4.bring the time of delivery forward5.effect shipment

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