一段导线的电阻为R,若从中间对折后合并成一条新导线其阻值为()。A、R/2 B、R/

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问题:

一段导线的电阻为R,若从中间对折后合并成一条新导线其阻值为()。

A、R/2

B、R/4

C、R/8

D、R/16

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题型:单项选择题

遵守实验室规则,学习基本的实验操作方法,是实验成功的重要保证。下列实验操作不正确的是

题型:单项选择题

牙齿磨耗可以发生在()。

A.面,切嵴,唇面

B.面,唇面,舌面

C.切嵴,唇面,舌面

D.面,邻面,舌面

E.面,切嵴,邻面

题型:单项选择题

Most people have no idea of the hard work. One of the questions that is always asked of me is (1) I became an animal collector in the first (2) .The answer is that I have always been interested in animals and zoos. According to my parents, the first word I was able to say with any (3) was not the conventional "mamma" or "daddy", (4) the word "zoo", which I would (5) over and over again with a shrill (6) until someone, in order to (7) me up, would take me to the zoo. When I (8) a little older, we lived in Greece and I had a great (9) of pets, ranging from owls to seahorses, and I spent all my spare time (10) the countryside in search of fresh specimens to (11) to my collection of pets.(12) on I went for a year to the City Zoo, as a student (13) , to get experience of the large animals, such as lions, bears, bison and ostriches, (14) were not easy to keep at home. When I left, I (15) had enough money of my own to be able to (16) my first trip and I have been going (17) ever since then. Though a collector’s job is not an easy one and is full of (18) , it is certainly a job which will appeal (19) all those who love animals and(20) .

第(17)空应选择()

A.normally

B.regularly

C.usually

D.often

题型:单项选择题

三显示自动闭塞进站色灯信号机显示一个绿色灯光,准许列按规定速度经()车站,表示出站及近路信号机在开放状态,进路上的道叉均开通直向位置。

A.侧线通过

B.正线通过

C.侧线停车

D.正线停车

题型:单项选择题

当一个人真正意识到病情严重,初次感到死亡的威胁时,典型的反应是()。

A.感到抑郁

B.感到异常愤怒

C.感到震惊并否认疾病

D.接受事实,并寻找可能的补救办法

E.以上都不是

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