水的预处理

患者，男，56岁。素患眩晕，因情急恼怒而突发头痛而胀，继则昏厥仆倒，呕血，不省人事，肢体强痉，舌红苔黄，脉弦。其病机是

A．气郁

B．气逆

C．气脱

D．气陷

E．气结

在图示的电路中，电源电动势E=12V，内阻r=2Ω，R₁=10Ω．当滑动变阻器在某一位置时，电路中电压表读数为2V，电流表读数为0.8A．两电表均为理想电表．求R₂的阻值．

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
The key to SNMP (76) is its simplicity. It has a small command set that does a good job of collecting information from (77) any network device. In a SNMP environment, (78) of the work is handled by the network management system. Devices that are being managed are not (79) with processing (80) that might affect their performance.

A．popularity

B．function

C．efficiency

D．power

艾滋病的传播途径不包括（）。

A.性传播

B.血液传播

C.粪-口途径

D.母婴传播

E.输血传播

测定变压器绕组绝缘电阻用（）。

A.2500V摇表

B.双臂电桥

C.单臂电桥