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【单选题】
关于慢性支气管炎的说法下列哪项是错误的A.
多见于青年人
B.
常见反复咳嗽、咳痰，可伴喘息症状
C.
常咳白色黏液泡沫痰
D.
可进展为慢性肺源性心脏病
E.
检查及干湿啰音和哮鸣音
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参考解析：
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皮皮学刷刷变学霸
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【单选题】以下关于P2P 基本概念的描述中错误的是？
A.
研究P2P 涉及三方面内容：P2P通信模式、P2P网络与P2P实现技术
B.
P2P 通信模式是指P2P网络中对等节点之间直接通信的能力
C.
P2P 网络是指在Internet中由对等节点组成的一种物理网络
D.
P2P 实现技术是指为实现对等节点直接通信的协议、软件
【单选题】_____________(代替) a carburetor,most engines have electronic fuel injection.
A.
Instead of
B.
Instead
C.
Of
【单选题】The most rapid period of fuel combust in a diesel engine cylinder should begin just before the piston reaches top dead center and____.
A.
when fuel injection has been completed
B.
when fuel vaporization has been completed
C.
should efficiently continue through the after burning period in aft properly designed engines
D.
should be completed shortly after passing top dead center
【单选题】_____________ (代替) a carburetor, most engines have electronic fuel injection.
A.
Instead of
B.
tread
C.
speed
【单选题】On most diesel engines, the governor controls the output speed by （）.
A.
controlling the amount of fuel injected into the cylinders
B.
varying the speed of the turbocharger
C.
adjusting the compression ratio
D.
changing the timing of the fuel injection camshaft
【单选题】A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.
A.
air turbulence
B.
fuel penetration
C.
fuel spray angle
D.
fuel injection rate
【单选题】设 int a=10, b=20, c=30;表达式 a
A.
5
B.
10
C.
20
D.
30
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