下列哪一项肿瘤标志物对肺癌诊断意义不大()。
A.CEA
B.CA-50
C.CA-125
D.CA-199
E.AFP
参考答案:E
I took my driving license with me on holiday, _______ I wanted to hire a car.
A.incase
B.even if
C.ever since
D.so that
某工厂要制造一个无盖的圆柱形发酵池,其容积是
,池底的材料30元/m2,池壁的材料20元/m2,问如何设计,才能使成本最低,最低成本是多少元