有一条链:植物鼠蛇獴.如果蛇全部被杀,其他三种生物数量变化如图,则曲线a和b分别

题型:选择题

问题:

有一条链:植物鼠蛇獴.如果蛇全部被杀,其他三种生物数量变化如图,则曲线a和b分别表示哪两种生物(  )

A.獴、植物

B.獴、鼠

C.植物、鼠

D.鼠、植物

考点:生态系统的自动调节能力
题型:选择题
短语辨析。
从方框里选择正确的短语,并用其正确的形式填空。
burn...to the ground, make one's way, glance through, vary from... to, make an effort, compare with, shoot at, be in a panic, be anx ious about, make an appointment
1. I had to start work, so I ____the morning paper.
2. In the game he _____ the basket 11 times but had only 5 succes ses.
3. Should I ____with you for the next two days?
4. Young people ____ to beautify our city.
5.____the past libraries, today's libraries are equipped much better.
6. The ages of the kids in the kindergarten_____2 years old ____6 years old.
7. The 1666 London fire____ many important buildings____.
8. Don't _____,boys;there's no danger.
9. I'm ____her safety.
10. My leg got hurt, but I____ home.
题型:选择题

HSE是Health、Safety和Environment管理体系的简称,其中的E是表示()。

A.健康

B.环境

C.安全

D.管理

题型:选择题

实施准时采购流程需要哪些措施?

题型:选择题

对本行政区域内的甲类传染病疫区,省级人民政府可

A.实施隔离措施
B.停工、停业、停课
C.宣布为疫区
D.实施封锁
E.对出入疫区的人员、物资和交通工具实施卫生检疫

题型:选择题

变电所直流系统分成若干回路供电,各个回路不能混用,为什么?

更多题库