化学用语是初中化学最基本的内容,学习化学用语不仅要能够熟练书写物质的化学式、化学

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化学用语是初中化学最基本的内容,学习化学用语不仅要能够熟练书写物质的化学式、化学反应的化学方程式,还要能运用它们进行相关计算.例如:

(1)三氧化二铁中铁元素的质量分数是______;

(2)160g硝酸铵中所含的氮元素的质量为______.

考点:物质组成元素的质量分数
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When I was growing up, I was embarrassed to be seen with my father. He (1) severely crippled and very short, and when we would walk together, his hand on my arm (2) balance, people would stare. I would inwardly be afraid (3) squirm at the unwanted attention. If he ever noticed or was bothered, he never let (4) .
It was difficult to coordinate (5) steps - his halting, mine impatient - and because of that, we didn’t say much as we went along. But as we started out, he always said, "You (6) the pace. I will try to adjust to you. "
Our usual walk was to or (7) the subway, which was how he got to (8) . He went to work sick, and (9) nasty weather. He almost never missed a day, and would (10) it to the office even if (11) could not: a matter of pride!
He never talked about himself as an object of pity, (12) did he show any envy of the more fortunate or able. What he looked for in others was a "good heart", and if he found one, the owner was good enough for him.
Now that I am older, I believe that is a proper standard (13) which to judge people, even though I still don’t know precisely (14) a "good heart" is. But I know the times I don’t have one myself.
He has (15) gone many years now, but I think (16) him often. I wonder if he sensed my reluctance to be seen with him during our (17) . If he did, I am (18) I never told him how sorry I was, how unworthy I was, how I regretted it. I think of him when I complain about trifles, when I am (19) of another’s good fortune, when I don’t have a "good heart".
At such times I put my hand on his arm to regain my (20) , and say, "You set the pace, I will try to adjust to you.\

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康明斯KTA-19G2柴油机中为了消除窜气造成的危害,设置了()。

A.机油加油口

B.油标尺口

C.曲轴箱通风器

D.增压器回油管

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间接标价法

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持个人本位目的论的教育学家为数甚多,其代表人物有()

A、卢梭

B、夸美纽斯

C、福禄倍尔

D、洛克

E、裴斯泰洛齐

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甲公司签发了一张银行承兑汇票交付于乙公司,乙公司向付款行提示承兑,付款行拒绝承兑,乙公司将汇票背书转让给丙公司,下列说法正确的有:()

A.汇票被拒绝承兑后,不得再背书转让

B.乙公司的背书行为无效

C.丙公司无权向乙公司追索

D.乙公司应对丙公司承担票据责任

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