生物膜像分子筛一样对大分子不能通过，对小分子能以较高的速度通过。()
查看答案
A．Its students can spend the whole summer at school.B．It can offer foundation courses
A. Its students can spend the whole summer at school.
B. It can offer foundation courses as well as advanced degrees.
C. It has established study centers all over the world.
D. It is the most important part of the British educational system.
A．maintenanceB．managementC．acquaintanceD．abuse
A. maintenance
B. management
C. acquaintance
D. abuse
假尿苷分子中糖苷键是()。
A. C-N连接
B. C-C 连接
C-O连接
D. N-H连接
America's colleges and universities have ______.
A. cultivated all kinds of work force
B. educated some prominent leaders for the whole world
C. done research only at the cutting edge of science
D. been the backbone of the west world
微信支付 
支付宝支付