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问题 单项选择题

脑组织在正常情况下主要利用葡萄糖供能，只有在下述哪种情况下脑组匀主要利用酮体

A．剧烈运动

B．空腹

C．短期饥饿

D．长期饥饿

E．轻型糖尿病

答案

参考答案：D

改错题

短文改错 （共10小题；每小题1分，满分10分）

Did you enjoy yourself yesterday? I suppose you do. But I’d like to tell you what a bad day I had yesterday. Everything just went wrongly. On the morning, my alarm clock didn’t ring, since I woke up an hour late. I was in such a hurry that I burnt my hand when I was cooking the breakfast. Then I ran out of the house to catch the 8:30 buses. This is the bus I usually take. But, you may laugh, I missed it of course. I am very unhappy, and scared as well because teacher hates the students coming late to school. So I ran three miles to school only to found that nobody was there. The school was quiet but peaceful. Our classroom was locked. I realized that moment: It was Sunday.
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单项选择题

锅炉在点火升汽阶段，下列说法错误的是（）。

A.水管锅炉比火管锅炉点火升汽时间快

B.锅炉的自动控制装置在此阶段改为手动操作

C.从点火到产生汽压的时间约占到满压时间的2/3

D.供汽前应进行下排污
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