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问题 单项选择题

自动喷水系统系统()在倒流防止器的进口前安装过滤器。

A.不宜

B.应

C.不应

D.必须

答案

参考答案：C

单项选择题

Questions 24-30


·Look at the questions for this part.
·You will hear a passage about "Health and Fitness ". You will listen to it twice.
·For Questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B, or C on the Answer Sheet.

Many Americans are getting fatter ______.

A．because of their poor eating habits and sedentary lifestyle

B．because of their ignorance about what is good for them

C．because of their p dislike for physical exercises
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多项选择题

影响供应商在行业中议价能力的冈素有( )。

A．产品差异化程度

B．产品重要性

C．后向一体化的可能性

D．产品在市场上有替代品
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