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Dialogue 2M: We're interested in your pure silk shirts.W: This is our newest style for this year.M:1If it proves to be satisfactory in our market, we'll order more.W: I'm sorry,2is 800 pieces at US$ 15.M: Oh, dear, this style is new to our customers. 800 pieces will be too many for us.3?W:500 pieces with a slight increase in price is the best I can do. One dollar more than the presentprice. OK?M: Well,4on the condition that you will deliver the goods right away.W: OK.5.A. Could you reduce your minimum to 500 piecesB. I'd like to order 300 pieces first for a trial order.C.I could accept your offerD. The minimum order for this styleE. You can count on it.

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Dialogue 3W: Good morning, Mr. Mailer. You've got our catalog and price list?M: Yes, your secretary gave them to me yesterday afternoon and I studied them carefully in theevening.W: 1,we're prepared to give you a 2% discount for orders over US$100,000 in value.M: 2%? It's too little. You see, it can hardly cover our expense.2?W:I'm afraid we can't agree to 5%. You know, 3.M: We are your old partner and we've done business with you for 10 years. We do hope you'll giveus a special consideration.W: OK. In that case,4. We suggest a 3.5% discount for an order of US$ 100,000 and over in value.M: Umm... 3.5% discount for orders of over US$100,000 in value. I agree.5?W: You'll have to sign the contract with us within one month and delivery can be made two months after that.W:6, Mr. Mailer?M: Er..., no, I think that's all. I'm very glad we've settled the problem.W:7and I hope it'll lead to more business between us.A. How about 5%B. What about delivery thenC.the cost of raw materials has doubled recentlyD. Considering our good relationshipE. I'm glad we have reached an agreementF. Is there anything you want to addG.Let's meet half way

细长杆承受轴向压力F的作用,其临界压力与( )无关。

A. 杆的材质
B. 杆的长度
C. 杆承受压力的大小
D. 杆的横截面形状和尺寸

压杆属于细长杆,中长杆还是短粗杆,是根据压杆的( )来到断的。

A. 长度
B. 横截面尺寸
C. 临界应力
D. 柔度

工程中细长杆除了要有足够的强度,还须有足够的稳定性。( )

A. 对
B. 错

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