实验室中有一只带盖空玻璃瓶、天平和配套的砝码以及足够的水，现要用这些器材测出某种

中药饮片调剂的重量误差为（）。

A.≤±5％

B.≤±3％

C.≤±2％

D.≤±4％

E.以上均不是

An internet is a combination of networks connected by (1). When a datagram goes from a source to a  (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a  (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?

空白（4）处应选择（）

A.destination

B.resource

C.packet

D.source

每一种商品都能明确地、准确地归入一个H.S编码的品目号下。（ ）

该批货物的包装是木质托盘。（）