在同一平面内的三个力,大小分别为3N、4N、5N,若三力同时作用于某一物体,则该

题型:选择题

问题:

在同一平面内的三个力,大小分别为3N、4N、5N,若三力同时作用于某一物体,则该物体所受三力合力的最大值和最小值分别为(  )

A.5N,3N

B.7N,2N

C.12N,3N

D.12N,0

考点:力的合成
题型:选择题

无锡是京杭大运河唯一穿城而过的城市,古运河在清名桥历史文化街区留下了一段“运河版、江南水弄堂”,堪称古运河听精华绝品。“水弄堂”两岸粉墙黛瓦,鳞次栉比,码头石埠,错落有致,构画出江南“人家尽枕河”的水乡风貌,让无数中外游客如痴如醉,你知道京杭大运河最早是谁统治时期开凿的?()

A.隋文帝

B.隋炀帝

C.唐太宗

D.唐玄宗

题型:选择题

Some time ago I discovered that one of my chairs had a broken leg. I didn't think there would be any difficulty in getting it mended, as there are a whole lot of antique(古董) shops near my home. So I left home one morning carrying the chair with me. I went into the first shop expecting a friendly reception. I was quite wrong. The man wouldn't even look at my chair.

The second shop, though slightly more polite, was just the same, and the third and the fourth—so I decided that my approach must be wrong.

I entered the fifth shop with a plan in my mind. I placed the chair on the floor and said to the shopkeeper, “Would you like to buy a chair?” He looked it over carefully and said, “Yes, not a bad chair. How much do you want for it, sir?”“Twenty pounds,”I said. “OK,”he said. “I'll give you twenty pounds.”“It's got a slightly broken leg,” I said. “Yes, I saw that, it's nothing.”

Everything was going according to plan and I was getting excited. “What will you do with it?” I asked. “Oh, it will be easy to sell once the repair is done.”“I'll buy it,” I said. “What do you mean?” “You've just sold it to me,” he said. “Yes, I know but I've changed my mind. I am sorry. I'll give you twenty seven pounds for it.” “You must be crazy,”he said. Then, suddenly the penny dropped. “I know what you want. You want me to repair your chair.” “You're right,”I said. “And what would you have done if I had walked in and said,‘Would you mend this chair for me?’”“I wouldn't have agreed to do it,”he said. “We don't do repairs, not enough money in it and too much trouble. But I'll mend this for you, shall we say for a fiver(五英镑钞票)?” He was a very nice man and was greatly amused by the whole thing.

小题1:We can learn from the text that in the first shop the writer_________.

A.was rather impolite

B.was warmly received

C.asked the shopkeeper to buy his chair

D.asked the shopkeeper to repair his chair小题2:The underlined word “approach” in the second paragraph means _________.

A.plan for dealing with things

B.decision to sell things

C.idea of repairing things

D.way of doing things小题3:The expression “the penny dropped” in the last paragraph means the shopkeeper ____.

A.changed his mind

B.accepted the offer

C.saw the writer's purpose

D.decided to help the writer小题4:How much did the writer pay?

A.£5.

B.£7.

C.£20.

D.£27.小题5:From the text, we can learn that the writer was _________.

A.honest

B.careful

C.smart

D.funny

题型:选择题

成本核算中在正确划分各个月份的费用界限时,应注意使用好“预提费用”和“待摊费用”科目。

题型:选择题

肛门坐浴的适宜水温为()

A.30~40℃

B.20~30℃

C.60~70℃

D.40~50℃

E.50~60℃

题型:选择题

采用分光光度计比色法测污水中的含油量时,将水样移入分液漏斗后要加入1:1的()。

A.硫酸

B.硝酸

C.盐酸

D.草酸

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