问答题

下面的各选项都可以绘制圆弧，除了（）项不行。

答案：正确答案：起点、圆心、方向

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Davidow's law tells us: if a company wants to lead the market.Which of the following must be avoided?____
A、The first to develop a new generation of products.
B、The first to eliminate existing products, and make successful new products enter the market as soon as possible.
C、So as to form new market and product standards.
D、Concentrate on optimizing existing products instead of developing new ones.

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在制冷装置中作干燥剂用的硅胶吸足水分后要再生，应将其_________。

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C．加热至140～160℃
D．加热至200℃以上