选择试剂盒不必考虑的指标是()
A.敏感度
B.特异度
C.重复性
D.诊断效率
E.稳定性
参考答案:D
The box was too heavy for me to carry, _______ I pulled it into my room. [ ]
A. so
B. and
C. but
D. or
三元系发生扩散时,扩散层内能否出现两相共存区域,三相共存区?为什么?