皮皮学,免费搜题
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【简答题】
阅读下面的短文,并完成短文后的任务。 The aim of students who come to school is to study. But to study requires a right way, or you waste either the time or the money. The following are the ways of studying. The best time for reading is morning, because in the morning, the air is fresh and the mind is clear. For that reason, we can get good result. (4) In studying we must have patience. If we have not known a text well, we must read it again. We should not read the next one till we have learned the first one. (5) When we are studying, we must put our hearts into the book, or we can get nothing from the book while we are reading. We must always ask 'whys'. If it is not well understood, write it down and ask our teachers or our parents, or friends. In any possible way, we must know it completely and what we've learned can be used well and made better. Though there are many ways for studying, yet the above mentioned will be quite enough if we can keep them in heart and do so. 任务1:根据短文内容回答下列问题。 1. What's the main idea of the passage? __________________________________________________________________ 2. How many ways for studying are mentioned in the passage? __________________________________________________________________ 3. Why must we always ask “whys” in our study? __________________________________________________________________ 任务2:将文中划线的句子翻译成汉语。 4. __________________________________________________________________ 5. __________________________________________________________________
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【判断题】收敛数列必有界,发散数列必无界。
A.
正确
B.
错误
【单选题】如图所示,重500N的人站在重2500N的船上,用滑轮组把船匀速拉向岸边,人和船相对静止。船受到水的阻力为1200N.不计绳重和滑轮轴摩擦,人拉绳的力为( )
A.
300N
B.
400N
C.
700N
D.
1700N
【判断题】收敛数列必有界。
A.
正确
B.
错误
【单选题】具有△ 4 -3-酮基结构的药物为()
A.
炔雌醇
B.
醋酸地塞米松
C.
氯贝丁酯
D.
盐酸普鲁卡因
E.
链霉素
【判断题】收敛数列必定有界
A.
正确
B.
错误
【多选题】直流电机的缺点有( )。
A.
调速性能差
B.
结构复杂
C.
成本高
D.
运行维护困难
【单选题】直流电机的缺点
A.
有电刷
B.
有火花
C.
有电枢
D.
有励磁
【单选题】下列具有△ 4 -3- 酮基结构的药物为( )
A.
氢化可的松
B.
雌二醇
C.
庆大霉素
D.
盐酸普鲁卡因
E.
维生素 C
【判断题】收敛数列必为有界数列
A.
正确
B.
错误
【判断题】收敛数列必有界
A.
正确
B.
错误