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【单选题】
女性，55岁，慢性咳嗽、咳痰、气喘15年。肘静脉压20cmH2O。胸部X线示：肺动脉段中度突出，右心室增大。最可能的诊断是A.
以上均不是
B.
慢性肺源性心脏病
C.
房间隔缺损
D.
原发性肺动脉高压症
E.
原发性肌病
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反馈参考答案：
举一反三
【单选题】下列对温斯顿对裘莉亚的欲望的性质发生了变化的说法中错误的是
A.
他们第一次的做爱不过是意志的行为
B.
她成了一种生理上的必需，成了一种他不仅需要而且感到有权享有的东西
C.
他对她逐渐由欲望转向情爱
D.
他对她只有性的欲望
【单选题】听力原文：W: How often do you clean your apartment? M: About once a week, l always clean it on Saturdays. But I clean my kitchen every day and I sweep the floor on Sundays, Thursdays and ,sometimes Saturda...
A.
On Saturdays.
B.
On Sundays.
C.
On Thursdays.
D.
Every day.
【单选题】听力原文：W: How often do you clean your apartment? M: About once a week. I always clean it on Saturdays. But I clean my kitchen every day and I sweep the floor on Sundays, Thursdays and sometimes Saturday...
A.
On Saturdays.
B.
On Thursdays.
C.
On Sundays.
D.
Every day.
【单选题】Do you often help your mother _____? [ ]
A.
with clean the house
B.
cleaning the house
C.
to cleaning the house
D.
clean the house
【单选题】下列关于马尔科夫信源的叙述中，不正确的是__________。
A.
某一时刻信源符号的输出只与当时的信源状态有关，而与之前的状态无关
B.
信源状态只由当前输出符号和前一时刻信源状态唯一确定
C.
一般马尔科夫信源的信息熵是其平均符号熵的极限值
D.
m 阶马尔科夫信源的极限熵等于 m+1 阶条件熵
【单选题】听力原文：M: How often do you clean your apartment? W: About once a week. I always clean it on Saturdays. But I clean my kitchen every day and I sweep the floor on Sundays, Thursdays and sometimes Saturday...
A.
On Saturdays.
B.
On Sundays.
C.
On Thursdays.
D.
Every day.
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