航向信标的工作频段为()MHz。 A.108–11.975 B.112-118 C.

题型:单项选择题

问题:

航向信标的工作频段为()MHz。

A.108–11.975

B.112-118

C.118-136

D.328.6–335.4

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题型:单项选择题

How often do you use your car? Can you use your car less often? Do you know the following facts in the UK?

·About 50% of all car journeys are just for fun.

·Over 80% people go to work by car.

·25% car journeys are under two miles.

·70% car journeys are under five miles.

WALKING & CYCLING

Instead of using the car for short journeys, why not walk or ride a bicycle? Walking is the most popular form of exercise—it’s healthy and it can save money. If you work nearby, try walking or cycling instead of driving. Walking your children to school gives them valuable road experience.

BUSES

Bus companies are using new buses: some run on new fuelswhich produce less pollution; some have easier access(通路)for disabled and old people. There are special traffic lanes (行车道)to make bus journeys easier. So do something to help solve the pollution problem----let the bus take you to work and your children to school.

TRAINS

All car journeys, long or short, can be hard work. For some trips, it is wiser to take the train. Leave your car at home and walk, cycle or take a bus to and from the station. Train travel is fast, safe and comfortable. Train tickets are not always expensive.

小题1:How many of car journeys are just for fun in the UK?

A.25%.

B.About 50%.

C.70%.

D.Over 80%.小题2:The writer believes that _____________________ can give children valuable road experience.

A.walking to school

B.traveling by train

C.taking new fuel buses

D.having car journeys for fun小题3:What does the writer think of traveling by train?

A.Tiring.

B.Exciting.

C.Terrible.

D.Comfortable.

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《医院感染管理规范》中规定,1000张床位以上医院的医院感染管理专职人员配备为()。

A.不得少于2人

B.不得少于3人

C.不得少于4人

D.不得少于5人

E.不得少于1人

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1966年,牛顿用玻璃三棱镜使太阳光发生了______,揭开了光的颜色之谜,这一现象说明白光是由______.

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对小动脉和小静脉平滑肌都有直接松弛作用的是()

A.硝普钠

B.肼屈嗪

C.哌唑嗪

D.可乐定

E.普萘洛尔

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DDOS攻击的主要目换是:()

A.破坏完整性和机密性

B.破坏可用性

C.破坏机密性和可用性

D.破坏机密性

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