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【单选题】
三极管工作在截止状态时其条件是（）。A.
发射结正向偏置，集电结反向偏置
B.
发射结电压小于其死区电压
C.
发射结集电结都正向偏置
D.
集电结电压大于其死区电压
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于羊水栓塞的临床表现，错误的是
A.
大多数发病突然，有时可没有先兆症状
B.
患者心率增快，肺部听诊可有湿啰音
C.
患者可因出血性休克而死亡
D.
羊水栓塞后期可出现少尿或无尿和尿毒症的表现
E.
临床可分为急性休克期、出血期、急性肾衰竭三个阶段，三个阶段必须按顺序出现
【简答题】现代家禽的繁育过程主要包括( )( )( )( )四个基本环节种
【简答题】膈的位置及形态结构特点?
【单选题】What is the main idea of the news item?
A.
IRA vows to end its armed struggle against Britain.
B.
Different opinions on the IRA decision in the Northern Ireland.
C.
The Democratic Party was responsible for the contradiction.
D.
The goal of IRA's protest against British governance.
【单选题】The union representative put across her argument very effectively.
A.
explained
B.
invented
C.
considered
D.
accepted
【单选题】超星学习通的用户名和 初始 登陆密码是 ( ) 。
A.
学号， gxdlzyxy123
B.
学号， 123456
C.
都是 123456
D.
gxdlzyxy123,123456
【单选题】The central idea of Ira Byocks book is to appeal to the hospital to______.
A.
save every life with every possible means
B.
help people to die if that is his/her will
C.
make people feel comfortable in their remaining hours
D.
consider whether the cure is worthwhile before conducting it
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