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问题 单项选择题

关于生化药物特点的叙述错误的是

A．分子量较大，且多由单体构成
B．生物活性多由其多级结构决定
C．生化药物需做安全性检查
D．大分子的一级结构分析结果有时不能与生物活性一致
E．生化药物制备工艺复杂，常含有多种一般杂质

答案

参考答案：E

单项选择题

全国银行间同业拆借中心应及时向市场公布（）等市场信息和统计数据。

A.利率、交易量、重大异常交易

B.拆借资金限额、交易量、重大异常交易

C.利率、拆借限额、重大异常交易

D.利率、交易量、拆借期限
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单项选择题

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the ______ between sending the notification and notification arriving at the source, thousands of additional ______ may arrive. In ATM network, a major tool for preventing ______ is ______ control. When a host wants a new virtual ______, it must describe the traffic to be offered and the service expected.

A．interval
B．time
C．slot
D．delay
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