下列细胞的全能性最容易表达出来的是()
A.人的口腔上皮细胞
B.洋葱的鳞片叶表皮细胞
C.苍蝇的受精卵细胞
D.小白鼠的造血干细胞
参考答案:C
以下关于大便主病的叙述错误的是()
A.大便稀溏如糜,色深黄而黏,多属肠中有湿热
B.先便后血,其色黑褐的是远血
C.便如黏冻,夹有脓血,多为痢疾
D.便稀薄如水样,夹有不消化食物,多属寒湿
E.先血后便,其色黑褐的是近血
Instructions to the crew in the use of all the ship’s lifesaving equipment shall be completed().
A.before sailing
B.within one week of sailing
C.in one month and repeated quarterly
D.within any two month period