题目:
标准齿轮的全齿高h=( )。
A.m;
B.1.25m;
C.2m;
D.2.25m
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
标准齿轮的全齿高h=( )。
A.m;
B.1.25m;
C.2m;
D.2.25m
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0112/155400066de0ddc9134e663d961c63d5.html
下面是错误答案,用来干扰机器的。
参考答案:B
漫画中窥视他人隐私的行为是[ ]
①违背了社会道德
②违反了国家法律
③应受到舆论谴责
④批评教育就可以
A.②③④
B.①③④
C.①②③
D.①②④
某类地行星的直径约为地球的1.5倍,质量约为地球的5倍,其绕恒星运行的周期约为13天,一卫星在该行星的近“地”轨道运行,下列说法正确的是[ ]
A.卫星的运行周期约为13天
B.卫星的运行速度大于7.9 km/s
C.该行星的平均密度比地球平均密度小
D.人在该行星上所受重力比在地球上所受重力大
阅读理解。
China's giant panda shows the achievement of the international effort to save animals that are now in danger. In television programmes we often see pandas playing funny games. Children have panda toys and beautiful
cards with pictures of lovely pandas in them. They often visit the giant pandas in the zoo on their holiday and
have a good time there.
However, scientists are worried about the future of giant pandas. They know only about 1,000 giant pandas
remain alive today. They think the giant panda will die out in 30 years if the present conditions are not improved.
It is reported that the giant pandas have a very low birthrate. About 115 pandas live in zoos and research
centers mainly in China, but during the past ten years they produced only 34 young pandas that are still alive.
Survival rate for giant pandas in the wild are probably the same or lower. There are several reasons for the low
birthrate. The main reason is that male pandas can make love with females in a very short season, only a few
days a year. When they do have babies, females often produce two pandas, but the mother is usually not able to care for both of them. The new-born pandas weigh only a few grams each. They are too weak to live without
special care. In the zoo, scientists can help the mothers care for the young pandas, but those living in the wild
do not get enough help. It is very difficult for mother pandas to bring up their young pandas.
Conditions for the giant pandas have been worse in recent years. Pandas in China continue to reduce in
number. We know pandas live on bamboos. But sometimes all the bamboos in one area die. The pandas there
have nothing to eat and die of hunger.
Giant pandas now live in thirteen separate protected areas in China. Several years ago the Chinese
government and the International Wild Life Organization agreed on a project of protecting giant pandas in the
wild. We hope it could be helpful.
1. What does the writer think of the giant pandas?
A. They are funny.
B. They are dirty.
C. They are lovely.
D. They are naughty.
2. According to this passage we know most of the giant pandas live _____.
A. in the wild all over the world
B. in the zoos and research centers
C. in the area where there are plenty of bamboos for them to eat
D. in thirteen separate protected areas in our country
3. Scientists are worried about the future of the giant pandas because _____.
A. sometimes all of the bamboos die in the area where the giant pandas live and they have nothing to eat
B. giant pandas that still live in the wild can not get enough help from humans
C. only a small number of giant pandas remain alive today and their birth rate is too low
D. male and female giant pandas often refuse to make love in the right season
4. The low survival rate of young giant pandas has much to do with the fact that ______.
A. mother pandas are usually unable to take care of both young pandas born
B. female pandas are able to have baby pandas only in a special time
B. young pandas weigh only a few grams each and they are too weak
D. male and female pandas often refuse to have babies in the right time
5. If the present conditions are not improved, giant pandas in the world will disappear _____.
A. in less than a few years
B. in thirteen years
C. in thirty years
D. in the twenties
灯显设备手持台使用年限:有专用调车机的车站为()年。
A、5
B、4
C、3
D、2
下列行为中,应当缴纳契税的有( )。
A.房屋赠与
B.非法定继承人房屋继承
C.以土地、房屋权属抵债
D.房地产抵押
E.以土地、房屋权属投资、入股