影响黑白负片显影的三个基本因素有温度、时间和()
A、层次
B、搅动
C、反差
D、影像
参考答案:B
Experts point out ____ we eat healthy food every day, we still need to do much exercise regularly to keep fit.
A.that although
B.that even
C.that as
D.whether
鉴别细菌性痢疾和阿米巴痢疾最可靠的依据是()
A.潜伏期的长短
B.毒血症状的轻重
C.大便常规发现红细胞的多少,是否有吞噬细胞或夏-雷结晶
D.大便检出病原体
E.抗生素治疗是否有效