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问题 单项选择题

测得某合成氨反应中合成塔入口气体体积比为：N2∶H2∶NH3=6∶18∶1，出气口为：N2∶H2∶NH3=9∶27∶8，则氨的转化率为（）。

A、20%；

B、25%；

C、50%；

D、75%

答案

参考答案：B

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A: Lucy, do you have any （76） p_______ for this weekend?
B: Yes. I’ll go to the village to visit my grandpa. It’s his 77th（77） b_____.
A: Congratulations! By the way, aren’t your grandparents living with you?
B: After my grandma passed away 3 years ago, my grandpa decided to live （78） a____. We have invited him to live with us several times, but he （79） r____.
A: Why? I think he would be nicely taken （80） c____ of if he lived with you.
B: We all do. He said he couldn’t leave his old neighborhood （81） w_____ all of his old friends lived. （82） B_____, he didn’t want to lose his independence.
A: It doesn’t matter if he is in good （83） h____, is he?
B: No. he suffers from a disease that needs close attention.
A: I’m sorry to hear that. But how can he live alone （84） u___ this condition?
B: Luckily, with the help of a new technology, which uses placed home sensors to record motion in key spots, such as the bathroom and bedroom, he can live in his own space, and we don’t （85） w____ about him.
A: How great it is!
（76）_____
（77）_____
（78）_____
（79）_____
（80）_____ 
（81）_____
（82）____ 
（83）____ 
（84）____ 
（85）___ 
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单项选择题

轻钢龙骨吊顶常用施工材料为（）。

A.U形轻钢龙骨

B.L形轻钢龙骨

C.UC形龙骨

D.以上全部都是
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