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狂犬疫苗和乙脑疫苗可用金黄色地鼠肾脏原代培养细胞生产,甲肝疫苗可用 Vero 细胞生产,Vero细胞是中国仓鼠卵巢细胞。A.
正确
B.
错误
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举一反三
【单选题】The new Russian holiday appears to demonstrate that Russia is ______.
A.
becoming less Communist.
B.
strongly enforcing a link between ideology and history.
C.
becoming opposed to the influence of western Christianity.
【单选题】These is a new type of advertisement becoming increasingly common in newspaper classified columns. It is sometimes placed among 'situations vacant', although it doesn't offer anyone job, and sometimes...
A.
informs job hunters of the opportunities available
B.
premises useful advice to those looking for employment
C.
divides available jobs into various types
D.
informs employer that people are available for work
【单选题】London is becoming a serious______to New York as the world's banking and financial services center.
A.
city
B.
rival
C.
employer
D.
opposition
【单选题】There is a new type of advertisement becoming increasingly common in newspaper classified columns. It is sometimes placed among 'situations vacant', although it doesn't offer anyone job, and sometimes...
A.
informs job hunters of the opportunities available
B.
promises useful advice to those looking for employment
C.
divides available jobs into various types
D.
informs employer that people are available for work
【单选题】图示三杆结构，欲使杆3的内力减小，应该（ ）【图片】
A.
增大杆 3 的横截面积
B.
减小杆 3 的横截面积
C.
减小杆 1 的横截面积
D.
减小杆 2 的横截面积
【单选题】图示三杆结构，欲使杆3的内力减小，应该 。【图片】
A.
（ A ）增大杆 3 的横截面积；
B.
（ B ）减小杆 3 的横截面积；
C.
（ C ）减小杆 1 的横截面积；
D.
（ D ）减小杆 2 的横截面积。
【单选题】图示三杆结构,欲使杆3的内力减小,应该( )
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/f4ab85f481e8e8cf5b3bdfeb120d1cc6.jpg">
B.
增大杆3的横截面积;
C.
减小杆3的横截面积;
D.
减小杆1的横截面积;
E.
减小杆2的横截面积。
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