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透视的类别有哪些

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名词解释：两点透视

名词解释：平行透视

Task 2: Cathy Brown is showing some products to Ryan Bush. Listen to the conversation and fill in the blanks with what you hear.[音频]W: Nice to meet you, Mr. Bush. What products are you interested in?M: I’m interested in your company’s printer. Can I have a look at your printers on display first?W: Sure. Here are our1which may help you make a good decision.M: Could you give me some idea of your prices?W: Here is2.M: Let me see. Er… it’s a little expensive. Could you give us3?W: I’m sorry. This is our lowest price and we can’t go any further.M: We’ll place a large order this time, if the price is more favorable.W: When you consider the quality of our products, you’ll see our price is4.M: Well, I’ll call our head office and see what they have to say.W: No problem. Thank you for your enquiry. If you need any more5 , please call me. This is my card.M: Thank you.

采用孔板送风时，下列说法正确的是（）。

A. 孔板上部稳压层的高度应按计算确定，且净高不应小于0.2m。
B. 孔板上部稳压层的高度应按计算确定，且净高不应小于0.3m。
C. 向稳压层内送风的速度宜采用3m/s~5m/s。
D. 向稳压层内送风的速度宜采用5m/s~8m/s。