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【单选题】
下列属于集合运算的是()
A.
笛卡尔积
B.
选择
C.
投影
D.
连接
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【单选题】大唾液腺包括
A.
舌下腺
B.
舌腺
C.
唇腺
D.
颊腺
E.
腭腺
【单选题】This china vase dates ______ the early Song Dynasty.
A.
to
B.
from
C.
back
D.
back to
【单选题】Please don't drop that china vase: it's one of my prize possessions.
A.
belongings
B.
ownership
C.
property
D.
shopping
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A.
a
B.
an
C.
the
D.
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A.
mustn't they
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【单选题】大豆中的蛋白质含量
A.
15~20%
B.
50~60%
C.
10~15%
D.
35~40%
【判断题】多克隆抗体血清含有多种蛋白质组分,因而要对有效的抗体成分进行分离、纯化。常用硫酸铵沉淀的方法进行纯化。
A.
正确
B.
错误
【单选题】大豆中的蛋白质含量为35%—40%,是植物性食物中蛋白质含量( )的。
A.
最低
B.
中等
C.
最高
D.
适中
【单选题】我国创业板市场于 2009年10月23日在( )正式启动。 A.深圳证券交易所 B.上海证券交易所 C.大连证券交易所 D.北京证券交易所
A.
B.
C.
D.
D
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