关于扫描参数接收带宽,叙述正确的是()。 A.接收带宽是MR接收信号的频率范围 B.

题型:多项选择题

问题:

关于扫描参数接收带宽,叙述正确的是()。

A.接收带宽是MR接收信号的频率范围

B.层面厚度与接收带宽无关

C.增加接收带宽可以提高图像信噪比

D.减小接收带宽可以减小图像的几何变形

E.扫描视野与接收带宽无关

考点:放射医学技术(医学高级)医学影像设备与成像原理医学影像设备与成像原理题库
题型:多项选择题

对于不允许中断供汽的企业,考虑经济技术因素,供热管网多可采用( )布置。

A.枝状管网

B.环状管网

C.复线的枝状管网

D.环状、枝状混合管网

题型:多项选择题

II、阅读(共两节,满分50分)

第一节阅读理解(共20小题;每小题2分,满分40分)

阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

A teenage girl is fighting for her life today after being struck by lightning as severe thunderstorms swept across Britain. The girl was one of four teenage girls from London who were hit by lightning in the Parade Ground area of Hyde Park during a storm. Earlier, Joseph Wharton, 14, died as he was struck by lightning while camping in his friend’s backyard in the West Midlands.

A spokesman for Scotland Yard said the girl remained in serious condition at St. Mary’s Hospital in Paddington. She had stopped breathing by the time the first paramedic (护理人员) arrived on the scene just two minutes after the strike at 5:40 p.m. yesterday.

The other three girls hit by the bolt all had injuries, and were taken to University College Hospital. Their conditions were not serious, the spokesman added.

The strike lifted the girls into the air and then dropped them to the ground, a witness reported.

A spokesman for the London Ambulance Service said paramedics risked their lives to treat the girls. “The storm was still overhead and lightning was still coming down while they were treating the patients,” he said. “All staff involved acted very professionally in providing fast treatment to these patients in very difficult circumstances.” Scotland Yard said the incident was being looked into by officers from the Royal Parks’ Operational Command Unit.

Joseph Wharton of Byland Way, Bloxwich, was hit during the extended thunderstorm which struck the region yesterday morning. He was pronounced dead at Walsall Manor Hospital.

He had been sleeping in a tent while staying with school friend Michael Lees at a house on nearby Cresswell Crescent.

West Midlands Ambulance Service said paramedics were called at 7:50 a.m. and unsuccessful attempts were made to revive(使苏醒)the sports-mad teenager. A spokesman for the Royal Society for the Prevention of Accidents said four or five people die each year as a result of lightning strikes in the UK.

26、All four girls________.

A. were killed by the lightning                B. were seriously injured

C. were being treated at the same hospital   D. were lifted up and dropped to the ground

27、The underlined word “bolt” probably means “________”.

A. thunder             B. rain                  C. storm                      D. lightning

28、Which of the following is TRUE according to the passage?

A. The boy was killed after the four girls had been hit.

B. The paramedics began to treat the girls after taking them to the hospital.

C. First-aid was given to the girls during the storm.

D. The boy was hit by lightning in the Parade Ground area of Hyde Park.

29、It can be inferred from the passage that ________.

A. many British people die from lightning strikes every year

B. the writer blames the government for the accident

C. the paramedics could also have been hit by lightning while aiding the girls

D. Joseph had been playing in the open air before the strike

30、This passage is probably taken from a ________.

A. magazine       B. newspaper   C. science fiction    D. weather report

题型:多项选择题

通过观察或实验获得的健康人群某种营养素的摄入量系指()

A.估计平均需求量

B.推荐摄入量

C.适宜摄入量

D.可耐受最高摄入量

E.生理需要量

题型:多项选择题

下列各项中,属于施工企业主营业务收入的是 ______。

A.施工承包合同收入

B.商品销售收入

C.提供劳务收入

D.让渡资产使用权收入

题型:多项选择题

在某一公共场所检测到有三个电磁辐射信号,其相应频率和场强分别为(1026kHz、12.00V/m)、(828kHz、8.00V/m)和(25MHz、8.04V/m),根据《电磁辐射防护规定》(GB/T8702-1988)查表可知,1026kHz的防护限值是40V/m,828kHz的防护限值是40V/m,25MHz的防护限值是13.4V/m,试通过计算评估此场所电磁辐射是否超标。

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