建砌筑砂浆保水率试验结果()精确至0.1%.A.两次试验结果的算术平均值 B.三次试

题型:单项选择题

问题:

建砌筑砂浆保水率试验结果()精确至0.1%.

A.两次试验结果的算术平均值

B.三次试验结果的算术平均值

C.四次试验结果的算术平均值

D.六次试验结果的算术平均值

考点:混凝土试验员考试混凝土基础知识及配合比设计混凝土基础知识及配合比设计题库
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在图书室借阅图书的期限为10天,10天后超过的天数要按每册0.5元收取延时服务费。小明借了一本故事书,如果每天看5页,16天才能全部看完。请你帮他算一算,他至少每天多看几页才能准时归还而不交延时服务费?

题型:单项选择题

苯的蒸气能与空气形成爆炸性混合物,爆炸极限一般为()。

(A)1.2﹪-4﹪ 

(B)1.2﹪-8﹪ 

(C)1.2﹪-12﹪ 

(D)1.2﹪-20﹪

题型:单项选择题

()是市场经济的核心与本质属性。

A、资本

B、人力

C、竞争

D、技术

题型:单项选择题

跗骨和趾骨及其连结在纵、横方向形成向上的弓形,称()。

题型:单项选择题

When Dave was eighteen, he bought a secondhand car for 200 so that he could travel to and from work more (1) than by bus. It worked quite well for a few years, but then it got so old, and it was costing him (2) much in repairs that he decided that he had better (3) it.

He asked among his friends to see if anyone was particularly (4) to buy a cheap car, but they all knew that it was falling to pieces, so (5) of them had any desire to buy it. Dave’s friend Sam saw that he was (6) when they met one evening, and said, "What’s (7) , Dave"

Dave told him, and Sam answered, "Well, what about advertising it in the paper You may (8) more for it that way than the cost of the advertisement!" Thinking that Sam’s (9) was sensible, he put an advertisement in an evening paper, which read "For sale: small car, (10) very little petrol, only two owners. Bargain at 50. " For two days after the advertisement first appeared, there was no (11) . But then on Saturday evening he had an enquiry. A man rang up and said he would like to (12) him about the car. "All right, " Dave said, feeling happy. He asked the man whether ten o’clock the next morning would be (13) or not. "Fine, " the man said, "and I’ll (14) my wife. We intend to go for a ride in it to (15) it. "

The next morning, at a quarter to ten, Dave parked the car in the square outside his front door, (16) to wait there for the people who had (17) his advertisement. Even Dave had to (18) that the car really looked like a wreck. Then, soon after he had got the car as clean (19) it could be, a police car stopped just behind him and a policeman got out. He looked at Dave’s car and then said, "Have you reported this (20) to us yet, sir\

7()

A.on 

B.up 

C.it 

D.that

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