具有器官特异性的肿瘤标志物是()
A.CEA
B.CA19-9
C.CA50
D.CA15-3
E.PSA
参考答案:E
"All hope was not lost. " means "__________."[ ]
A. There was no hope at all
B. Hope was everywhere
C. No hope was lost
D. Not all hope was lost
下列变化属于化学变化的是
A.石油分离出汽油、煤油和柴油等
B.煤焦化产生焦炭、煤焦油、焦炉气等
C.工业上分离空气制取氧气、氮气
D.膜法和热法淡化海水