材料变形是因为其中一部分纤维与另一部分纤维()造成的。A、长短不一 B、长短一致 C

题型:单项选择题

问题:

材料变形是因为其中一部分纤维与另一部分纤维()造成的。

A、长短不一

B、长短一致

C、方向交叉

D、方向一致

考点:冷作钣金工铆工(中级)铆工(中级)题库
题型:单项选择题

下面给出一个问题的算法:

S1 输入x.

S2 若x≤2,则执行S3;否则执行S4.

S3 输出-2x-1.

S4 输出x2-6x+3.

问题:

(1)这个算法解决的是什么问题?

(2)当输入的x值为多大时,输出的数值最小?

题型:单项选择题

下列哪项不能诱发窦性心动过速:【 】

A.发热

B.缺氧

C.高血钾

D.失血性贫血

E.频繁腹泻

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\

16().

A.happening 

B.meaning 

C.turning 

D.failing

题型:单项选择题

柴油机主要部件安装时其螺栓的收紧应按说明书要求的扭力并()收紧。

A、从上至下

B、从下至上

C、对称交叉

题型:单项选择题

植物光合速率受多种环境因素的影响。下图表示在不同环境条件下黄瓜的光合速率变化情况,相关叙述正确的是()

A.光照强度在5~6时,植物光合速率随光照强度升高而升高

B.光照强度一定时,CO2浓度对光合速率的影响比温度的影响明显

C.光照强度为1时,植物光合速率极低,细胞中ATP的含量几乎为0

D.光照强度和CO2浓度一定时,植物光合速率随着温度升高而不断加快

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