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【多选题】
隧道工程的规模大小，一般可以从长度和断面两个方面加以区分。我国铁路隧道的开挖断面按其开挖断面等级可划分：断面积在 10m 2 及以下的为[填空1]，断面积在10m 2 以上至 50m 2 的为[填空2]，断面积在 50m 2 以上至 100m 2 的为[填空3]，断面积在 100m 2 以上的为特大断面。A.
小断面
B.
中等断面
C.
大断面
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【简答题】选词填空：Signs barring cell－phone use are a familiar sight to anyone who has ever sat in a hospital waiting room. But theSection A（2016年6月英语四级卷三真题及答案） Signs barring cell-phone use are a familiar sight to ...
【单选题】Since anti-smoking campaigns made teens aware of the risks of smoking, the percentage of teens smoking has dropped from 28 to 20 percent over the last ten years. Additionally, in schools where student...
A.
If more schools would conduct anti-smoking campaigns, the number of teens smoking would greatly decline.
B.
Evidence suggests that health education programs have a favorable effect on teen behavior .
C.
Health education clinics are a positive influence on how people of all ages take care of themselves.
D.
One study found that students in schools with comprehensive health education were less likely to use drugs or to attempt suicide.
【单选题】Which devices are locating and homing signals in the GMDSS provided by?
A.
EPIRB and SART.
B.
NAVTEX and EG
C.
Radar and SART.
D.
DF and FLAG.
【简答题】容积室用字母()表示。
【单选题】某镇上年末生猪存栏头数为5万头,比年初多2000头,这两个指标是( )
A.
时点指标
B.
前者时期指标，后者时点指标
C.
时期指标
D.
前者时点指标，后者时期指标
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