问题 问答题

某城市道路工程,基层采用石灰稳定土,面层采用水泥混凝土。在施工过程中的部分质量控制要点如下:
1.对基层施工的控制要点:
(1)基层土颗粒最大粒径不超过40mm。
(2)基层细粒土最大粒径不大于10mm。
(3)用12t以上压路机碾压,先重型后轻型。
(4)严禁用薄层贴补的办法找平基层。
(5)养生采用干养,养生期不宜小于7d。
2.对面层施工的控制要点:
(1)水泥采用不低于P32.5级的普通硅酸盐水泥。
(2)碎(砾)石选用最大粒径不超过50mm。
(3)设计混凝土配合比时,以抗折强度设计,以抗压强度检验。
(4)混凝土搅拌的最长时间不得超过最短时间的5倍。

对基层施工中的控制要点有哪些不妥之处请改正。

答案

参考答案:对基层施工中的控制要点的妥当与否的判定与改正:
(1)不妥之处:基层土颗粒最大粒径不超过40mm。
正确做法:基层土颗粒最大粒径不超过37.5mm。
(2)不妥之处:基层细粒土最大粒径不大于10mm。
正确做法:基层细粒土最大粒径不大于15mm。
(3)不妥之处:用12t以上压路机碾压,先重型后轻型。
正确做法:用12t以上压路机碾压,先轻型后重型。
(4)不妥之处:养护采用干养,养护期不宜小于7d。
正确做法:养护采用湿养,养护期不宜小于7d。

选择题
阅读理解

It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can’t fix the damage.Sometimes they are afraid to try something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.

Dr.Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.

Dr.White tried his idea on 13 monkeys. First he taught them to do different jobs, then he operated on them. He made the monkeys’ blood go through a machine. The machine cooled the blood. Then the machine sent the blood back to the monkeys’ brains. When the brain’s temperature was 10 ℃, Dr.White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.

小题1:The biggest difficulty in operating on the damaged brain is that____ .

A.the time is too short for doctors

B.the patients are often too nervous

C.the damage is extremely hard to fix

D.the blood-cooling machine might break down小题2:The brain operation was made possible mainly by____ .

A.taking the blood out of the brain

B.trying the operation on monkeys first

C.having the blood go through a machine

D.lowering the brain’s temperature小题3:With Dr. White’s new idea, the operation on the damaged brain____ .

A.can last as long as 30 minutes

B.can keep the brain’s blood warm

C.can keep the patient’s brain healthy

D.can help monkeys do different jobs小题4:What is the right order of the steps in the operation?

a.send the cooled blood back to the brain   b.stop the blood to the brain

c.have the blood cooled down            d.operate on the brain

A.a,b,c,d

B.c,a,b,d

C.c,b,d,a

D.b,c,d,a