生态影响经济损益分析的原则不包括( )。
A．生态质量作为生产力要素 B．可持续发展C．突出重点，兼顾一般 D．一次性估价
参考答案：B
消毒胡刷、发梳、刀具的常用方法中除外
A．漂白粉液浸泡B．新洁尔灭加亚硝酸钠浸泡C．杜灭芬加亚硝酸钠浸泡D．来苏液浸泡E．酒精或消毒净擦拭
The network layer provides services to the ______ layer. It can be based on either virtual circuits or datagrams. In both cases, its main job is routing packets from the source to the destination.
A．transport
B．application
C．presentation
D．data link
