通常用()来表示纱线的粗细程度,它是纱线的最重要的指标。A.直径 B.截面积 C.线

题型:单项选择题

问题:

通常用()来表示纱线的粗细程度,它是纱线的最重要的指标。

A.直径

B.截面积

C.线密度

D.长度

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史事传说往往从不同的角度和侧面记录历史事件的某一个片段,而不关心(),它的侧重点在记事。

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正常精液pH为

A.4.0~5.0

B.5.0~6.2

C.6.2~7.2

D.7.2~7.8

E.7.8~8.0

题型:单项选择题

设NA为阿伏加德罗常数的数值,下列说法中正确的是[ ]

A.标准状况下,11. 2 L戊烷所含的分子数为0.5NA

B.28 g乙烯所含共用电子对的数目为4NA

C.标准状况下,11. 2 L二氯甲烷所含分子数为0.5NA

D.现有乙烯和丙烯(C3H6)的混合气体共14 g,则其所含原子数目为3NA

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Are you a man or a mouse When people ask this question they want to know (1) you think you are a (2) person or a coward. But you will never really know the answer to this question (3) you are tested in real life. Some people (4) they are brave but when they come face to face with real (5) , they act like cowards. Others think of themselves as cowards, but when they meet danger, they act like (6)

Lenny had always thought of himself as a (7) person. He got worried before examinations. He worried about his job and health. All he wanted in life was to be safe and healthy. (8) , on January 15th, 2002, a plane crashed into the Potomac River in Washington. Lenny went to the river to see what was happening. He saw a woman in the (9) water. Lenny did not feel afraid. He kept very (10) and did a very dangerous thing. He jumped into the Potomac, (11) to the woman, and kept her head (12) the water. Seventy-eight people died that day. Thanks to Lenny, it was not (13) .

When you are in a very (14) situation and feel afraid, the body automatically produces a chemical in the blood. The chemical is called adrenalin. (15) adrenalin in the blood system, you actually feel per and per and are (16) to fight or run away. However, when you are absolutely terrified, the body can produce too much adrenalin. When this (17) , the muscles become very hard and you find you (18) move at all. You are then paralyzed with fear. This is (19) when we are very frightened, we sometimes say we’re "petrified". This word comes from the Greek word "petros", which means "stone". We are (20) frightened that we become stonelike.

6()

A.soldiers 

B.mice 

C.heroes 

D.cowards

题型:单项选择题

普遍性目标的有2个基本特点,分别是()。

A.普遍性和模糊性

B.原则性和直观性

C.直观性和普遍性

D.明确性和实用性

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