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[音频]2. A Western MealJeff and Jill work in the same company. Jeff asks Jill to eat out after a week’s work. They’re now ordering their meal.1) First ListeningListening to the conversation and fill in the blanks.Jeff: I’m glad that we finally finished the (1)____ .Jill: I feel (2)____ too. By the way, thanks for inviting me. This is really a nice place.Jeff: Don’t mention it. You’ve worked so hard and you (3)____ it.Waiter: Good evening. Here’s our (4)____ . What can I get you to (5)____ ?Jill: I’d like a martini, please.Jeff: A glass of white wine for me.Waiter: OK. Are you ready to (6)____? Our (7)____ for today are charbroiled steak and leg of lamb.Jill: Sounds good. I’d like the leg of lamb.Jeff: And I’ll have the charbroiled steak.Waiter: OK. (8)____ are peas and carrots, broccoli, corn, or string beans.Jill: Peas and carrots.Waiter: Baked or mashed potatoes?Jill: Mashed.Waiter: And what kind of (9)____ ? French, Italian, blue cheese, or Russian?Jill: Italian.Waiter: Yes, ma’am. And Sir, how would you like you steak (10)____ ?Jeff: Well, (11)____. And with the broccoli and baked potato.Waiter: OK, fine.Jeff: Oh, and French dressing on the salad, please.Waiter: What would you like for (12)____ ?Jill: I’m thinking of almonds ice cream cake.Jeff: And I’d like chocolate mousse cake.Waiter: OK. I’ll take your menu.2) Second ListeningListen to the conversation again and then do the role play with your partners. Pay attention to the phrases and sentence patterns used in ordering meals.

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刚体作平动时,其上各点的轨迹可以是

A. 直线
B. 平面曲线
C. 空间曲线

平动刚体内各点在同一瞬时

A. 速度相同,加速度相同
B. 速度相同,加速度不同
C. 速度不同,加速度相同
D. 速度不同,加速度不同

转动刚体内任一点的速度和加速度的大小

A. 都相等
B. 与该点至转轴的距离成正比

计算题1(习题6-1改)中,(1)刚体运动形式分析:杆O1A做1,杆AB做2,杆CD做3,杆O2B做4;(2)连接点分析:杆O1A与杆AB连接点A属于5,杆AB与杆CD连接点C属于6,杆AB与杆O2B连接点B属于7;(3)速度分析:由杆O1A角速度ω→O1A上A点的速度为8,由A点连接方式→AB上A点的速度为9,由AB运动形式→AB上B点的速度为10,由B点连接方式→O2B上B点的速度为11,由O2B运动形式→O2B的角速度为12;(4)加速度分析:由杆O1A角速度ω、匀速→O1A上A点的切向加速度为13,法向加速度为14,分析思路同速度分析,O2B的角加速度为15。

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