妄想是 A．思维联想连贯性障碍 B．大量涌现的不自主的观念 C．不能被说服的病态信念

A middleman's work may become difficult because ______.

A．manufacturers run their production on a much higher level

B．market demand may not be the same as industrial production

C．retailers are not necessary in running their retailing business

D．retailers demand lower levels than those demanded by manufacturers

同样电压的直流电比交流电危害大。

进行储存式自体输血的患者，一般要求采血前Hb浓度（）。

A.男性≥120g/L，女性≥110g/L

B.男性≥100g/L，女性≥100g/L

C.男性≥110g/L，女性≥110g/L

D.男性≥110g/L，女性≥100g/L

E.男性≥120g/L，女性≥120g/L

下列哪一个不是变质作用的产物。（）。

A、变斑晶；

B、眼球花岗岩；

C、斑晶；

D、麻砾岩