超声波可以以纵波、横波、表面波等波型传播，在超声诊断中主要应用的是：( )
A. 横波
B. 表面波
C. 纵波
D. 球面波
E. 以上均不是
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What statement about sitting arrangement is not ture?
A. Sit people who have common interests together
B. Pair male and female guests
C. Sit guests of honor in order
D. The most important person should be seated at the left hand of the host
Which business behavious are appropriate?
A. Be a good listener.
B. Talk with confidence
C. Get nervous
D. Start with the nearest dinnerware
What statements about Chinese or Western eating habits are true?
A. In the west every one has their own plate of food.
B. In China people share the dishes.
Chinese are not fond of their culture.
D. A Western visitor may supprise that Chinese hosts like to put food on the plates of their guests.
实现利润最大化要涉及生产问题的两个方面：生产的技术方面和生产的经济方面。其中生产的技术方面，是指（）
A. 投入的生产要素与产量之间的物质技术关系
B. 成本与收益之间的经济关系
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