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【单选题】
进行居民吸烟率的社会调查时,先抽出若干街道,再从中各抽得两个居委会进行各户普查,这种调查方法是A.
单纯随机抽样
B.
系统抽样
C.
分层抽样
D.
整群抽样
E.
多级整群抽样
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【单选题】These leather handbags are fully illustrated in the catalogue and are()the same high quality as our gloves.
A.
for
B.
of
C.
to
D.
in
【单选题】How did the man know Judy?
A.
They were in the same math class.
B.
They were in the same high school.
C.
He sat in front of Judy in math class.
D.
He met her in a party.
【简答题】If one high tide occurs at 1:00 am. the next high tide at the same point will occur at about ______.
【单选题】当患者的动脉血氧分压低于多少千帕(KPa)时需给予吸氧
A.
4.6kPa(35 mmHg)
B.
5.6kPa(42mmHg)
C.
6.6kPa(50mmHg)
D.
7.6kPa(57mmHg)
E.
8.6kPa(65mmHg)
【单选题】当患者的动脉血氧分压低于多少千帕(kPa)时需给予吸氧
A.
4.6 kPa(35 mmHg)
B.
5.6 kPa(42 mmHg)
C.
6.6 kPa(50 mmHg)
D.
7.6 kPa(57 mmHg)
E.
8.6 kPa(65 mmHg)
【简答题】四冲程汽油机总体构造上有何特点?
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