检查砷盐限度时，使用醋酸铅棉花的目的是A．使溴化汞试纸呈色均匀 B．防止发生瓶内的飞

存货清查过程中发现的定额损耗应记人“营业外支出”账户。()

采用水溶性基质制备栓剂的融变时限是（）

A.15分钟

B.30分钟

C.45分钟

D.60分钟

E.90分钟

Flow control is a function that prevents network congestion by ensuring that (59) do not overwhelm (60) with data.

There are three commonly used methods for handling network congestion. (61) is used by network devices to temporarily store bursts of excess data in memory until they can be processed (62) are used by receiving devices to help prevent their buffers from overflowing. (63) is a flow-control scheme in which the source device requires an acknowledgment from the destination aider a certain number of packets have been transmitted.

59（）

A．transmitting devices

B．transmitted devices

C．receiving devices

D．received devices

患者女性，59岁。慢性胆囊炎、胆石症急性发作。高血压、冠心病（心绞痛）10年，ECG示冠状动脉供血不足，心率66次/分，血压185/100mmHg。行胆囊切除加胆总管探查T形管引流术，术中处理胆囊时突然心率减慢、室性二联律。预防该病人上述不良反应的最好办法是（）

A.术前肌注阿托品

B.不牵拉胆囊

C.胆囊三角区神经局麻药封闭

D.静注异丙肾上腺素

E.静注氯胺酮

不同品系之间杂交产生的后代是（）。

A.近交系

B.封闭群

C.远交群

D.杂交群