题目内容：
一般情况下，燃气输送管网采用（ ）管道。
A．高、中、低压 B．高、中压
C．中、低压
D．低压
参考答案：
答案解析：
单选题：一般情况下，燃气输送管网采用（ ）管道。
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B．高、中压
C．中、低压
D．低压
B．高、中压
C．中、低压
D．低压
对避震疏散场地的布局要求不包括（ ）。
对避震疏散场地的布局要求不包括（ ）。 A．远离火灾、爆炸和热辐射源 B．地势较低，不易塌陷 C．内有供水设施或易于设置临时供水设施 D．易于铺设临时供电和通
There are no permanent inhabitants in Antarctica because
There are no permanent inhabitants in Antarctica becauseA．it is too ho B．it is t
根据材料请回答Population DensitiesThe average population density(密度
根据材料请回答Population DensitiesThe average population density(密度)of the world is 47
He forced himself to speak to her.
He forced himself to speak to her.A．pleaded B．appealed C．compelled D．instructed
I can dimly remember my fourth birthday.
I can dimly remember my fourth birthday.A．inadequately B．hardly C．faintly D．suff