风机振动大的原因是什么？如何处理？

发布时间：2019-07-07 14:51 │ 来源：www.tikuol.com

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问题：

风机振动大的原因是什么？如何处理？

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—________ are you going to be a basketball player?

—I'm going to practise basketball every day. [ ]

A. What

B. How

C. When

D. Where

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完形填空。

     Nowadays we call see more and more electric bikes in the street. Electric bikes are easy to  1  and they
can run faster than ordinary bikes. So they become very  2 in many cities in China now.
     But the electric bikes also  3  many traffic accidents happen. So the Chinese government plans to make a
new  4  for the electric bike riders (骑车者). If  5 electric bike is heavier than 40 kilos and it can go  6 than
20 kilometers an hour, its rider must get a license (执照). It means riders have to pass driving test  7 they
ride their electric bikes on the road.
     People have different ideas about the rule. Some people like the rule  8 they think it will make the street
much safer. But some people are not  9 the new rule at all. One rider said, "I don't want to get a license or
10 , I don't like too many rules in life." What's your idea, my friends?

( )1. A. listen
( )2. A. popular
( )3. A. share
( )4. A. message
( )5. A. a
( )6. A. faster
( )7. A. during
( )8. A. so
( )9. A. happy with
( )10. A. something

B. ride
B. hard
B. throw
B. advice
B. an
B. fast
B. after
B. because
B. worried about
B. nothing

C. play
C. difficult
C. protect
C. rule
C. the
C. fastest
C. before
C. but
C. sorry about
C. everything

D. bring
D. dangerous
D. make
D. letter
D. /
D. slowly
D. in
D. and
D. surprised at
D. anything

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题型：问答题简答题

刘女性，42岁，母亲、外婆和姐姐均得过乳癌，家族有遗传史，此时患者担心自身容易得乳癌疾病（）。

A.倾向因素

B.促成因素

C.强化因素

D.抑制因素

E.强制因素

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何谓新生儿生理性黄疸？

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某同学用图甲所示的实验装置验证机械能守恒定律．已知打点计时器所用电源的频率为50Hz，重物质量m=1kg，当地重力加速度大小为g=9.80m/s²．实验中该同学得到的一条点迹清晰的完整纸带如图乙所示，纸带上的第一个点记为O，另选连续的三个点A、B、C进行测量，图中给出了这三个点到O点的距离h_A、h_B和h_C的值．回答下列问题（以下计算结果均保留3位有效数字）：

（1）打点计时器打B点时，重物速度的大小v_B=______m/s；

（2）根据以上数据，可知重物由O点运动到B点的过程中，重力势能的减少量等于______J，动能的增加量等于______J．重力势能的减少量大于动能的增加量的原因是______．

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