列管式换热器气阻现象一般发生在管程。
参考答案:错
解析:列管式换热器气阻现象一般发生在壳程。
History is ( ) a subject that only lets us know something in history; it also tells us a lot of truth.
A.less than
B.more than
C.no more than
D.not more than
下列哪一种组织或界面回声最强:
A.肾中央区(肾窦区)
B.主动脉壁
C.脏层胸膜——肺
D.腹直肌
E.横膈(包括膈胸膜)