将一粒花粉培育成幼苗,将它的茎尖用秋水仙素处理,长大后该植物正常开花结果。与该植

题型:选择题

问题:

将一粒花粉培育成幼苗,将它的茎尖用秋水仙素处理,长大后该植物正常开花结果。与该植株染色体数目不同的是[ ]

A.根细胞

B.叶细胞

C.茎细胞

D.子房壁细胞

考点:月季的花药培养
题型:选择题
下列运算正确的是(  )
A.a4-a3=aB.
1
2
y2-
1
3
y2=
1
6
C.3a+6b=9abD.3a3b-3ba3=0
题型:选择题

冷裂纹经常发生在低碳钢和奥氏体钢中。( )

题型:选择题

完成句子

1. Children should be encouraged to explore ____________________(任何感到好奇的事情).

(whatever)

2. I'm sorry. I ________________(应该打个电话) to tell you I was coming. (phone)

3. When you hang wet clothes near a fire, you will see steam __________________

(从潮湿的衣服上升起).  (rise)

4. You __________________(不可能看见她)in her office last Friday; she’s been out of town for

two weeks.(see)

5. While I agree with most of what you said, I don't agree with your viewpoint ________________

(这个实验失败了). (failure)

6. The driver failed to keep calm in the emergency; otherwise the accident ________________

(就可以避免). (stop)

7. Not only ________________(他被逮捕)but he had been sent to prison as well. (arrest)

8. ________________(不会用)a computer makes it more difficult for him to do his academic

research. (use)

9. John received an invitation to dinner, and with ________________(他做完了活), he gladly

accepted it. (finish)

10. There is no possibility ________________(他会信守诺言). He is always telling lies. (keep)

题型:选择题

在警衔的等级设置中,( )是初级警官。

A.警监和警督
B.警督和警司
C.警司和警员
D.警监和警员

题型:选择题

海关将从事加工贸易的企业分为A、B、C、D四种类别,实施动态分类管理。下列属于C类企业的条件有( )

A.一年内偷逃应缴税款5万元人民币以上、不满50万元人民币的
B.一年内报关单差错率在10%以上的
C.出借企业名义,供他人办理进出口货物报关纳税事宜的
D.拖欠海关税费200万元人民币以下

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