全国农信银通存通兑业务,通兑业务收费标准为按()%,最低()元,最高不超过()元。
A.2;1;10
B.4;2;20
C.8;2;40
D.10;6;50
参考答案:C
The Simple Network Management Protocol (SNMP)is an (66) protocol that facilitates the exchange of management information between (67) . It is part of the Transmission Control Protocol/Internet Protocol(TCP/IP) protocol suite. SNMP enables network (68) to manage network performance, find and sole network problems, and plan for (69) An SNMP -managed network consists of three key components: managed devices , (70) ,and network -management systems .
A.network stations
B.network clients
C.network devices
D.network servers
利用如图所示的装置,可以验证NH3和HCl的有关性质。实验前a、b、c活塞均关闭。
(1)若要在烧瓶Ⅱ中产生“喷泉”现象,烧瓶I中不产生“喷泉”现象,其操作方法是________。
(2)若先打开a、c活塞,再挤压胶头滴管,在烧瓶中可观察到的现象是______。
(3)通过挤压胶头滴管和控制活塞的开关,在烧瓶I中产生“喷泉”现象,烧瓶Ⅱ中不产生“喷泉”现象,其操作方法是________。