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汽车的心脏，给汽车提供动力的是（）
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主要表现为血液运行与呼吸吐纳协同调节的两脏是（）。
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上睑退缩和滞后见于()
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关于分支的思想错误的是()。
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何谓覆膜砂？基本配比是什么？覆膜砂制芯的优点有哪些？
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男，30岁，有风湿性心脏病史，发热2周，体温38.5℃左右，伴气促、乏力，体检：皮下可见出血点，主动脉瓣区双期杂音，肝肋下2cm，脾肋下可及，血红蛋白72g/L，最可能的诊断是（）
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A: Good morning．My name is Mr．Brown．I'm from Australia．Here is my card. B: Thank you．I'm pleased to meet you, Mr．Brown．My name is Kathy Perless, the representative of GREen Textile Import and Export Corporation. A: Pleased to meet you too, Ms．Perless．I travel a lot every year on business, but this is my first visit to your country．I must say I have been much impressed by your friendly people. B: Thank you for saying so．Have you seen the exhibition halls? On display are most of our products, such as silk, woolen knitwear, cotton piece goods, and garments. A: Oh, yes．I had a look yesterday．I found some of the exhibits to be fine in quality and beautiful in design．The exhibition has successfully displayed to me what your corporation handles．I've gone over the catalogue and the pamphlets enclosed in your last letter．I've got some idea of your exports．I'm interested in your silk blouses. B: Our silk is known for its good quality．It is one of our traditional exports．Silk blouses are brightly colored and beautifully designed．They've met with great favor overseas and are always in great demand. A: Some of them seem to be of the latest style．Now I've a feeling that we can do a lot of trade in this line．We wish to establish relations with you. B: Your desire coincides with ours. A: Concerning our financial position, credit standing and trade reputation, you may refer to Bank of Hong Kong, or to our local Chamber of Commerce or inquiry agencies. B: Thank you for your information．As you know, our corporation is a state-owned one．We always trade with foreign countries on the basis of equality and mutual benefit．Establishing business relations between us will be to our mutual benefit．I have no doubt that it will bring about closer ties between us. A: That sounds interesting．I'll send a fax home．As soon as I receive a definite answer, I'll make a specific inquiry. B: We'll then make an offer as soon as possible．I hope a lot of business will be conducted between us. A: So do I.
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汽车扬声器的振动系统主要包括有（）。
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什么是后勤管理追求的经济活动原则（）
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延伸率表示的是材料的塑性。