剖选择种猪时所依据的繁殖性指标主要有()()()()等。

题型:填空题

问题:

剖选择种猪时所依据的繁殖性指标主要有()()()()等。

考点:畜牧、兽医科学畜牧生产学畜牧生产学题库
题型:填空题

若A={x|ax2+2x+1=0,x∈R}中只含有一个元素,则a=(    ).

题型:填空题
从方框中选择适当的词语填空。
have a look at,  at a very good price,  on sale,  
in blue,  I'm sorry,  how much,  buy…from,  
in all colors,  come down to,  sells…to…
1. The boy __________ is my brother.
2. This shop has sweaters __________.
3. Boys can __________ T-shirts __________ this shop.
4. Please __________ my home and have dinner with us.
5. We have shoes __________.
6. This store __________ school things __________ the students.
7. Can I __________ your family photo?
8. The white pants are _____________ for $20.
9. —What time is it? —Oh, __________. I don't have a watch.
10.—__________ are the red socks? —They are $5.
题型:填空题

简述渠道渗流观测的目的及主要观测内容。

题型:填空题

当一国国际收支平衡表误差与遗漏账户余额长期在借方时,通常表明()。

A.贸易逆差

B.贸易顺差

C.资本外逃

D.资本内逃

题型:填空题

无极绳绞车适用在水平巷道或倾角不大于()度巷道中。

A、10

B、20

C、30

D、40

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