大红细胞直径为()
A.<6μm
B.>9μm
C.>10μm
D.>15μm
E.>20μm
参考答案:C
The two brothers look so much alike that it is difficult to .
A.tell them from
B.tell from them
C.tell them apart
D.tell apart them
下列除杂(括号内的是杂质)所选试剂合理的是[ ]
A.Cu(Zn) 稀盐酸
B.CO2气体(HCl) 氢氧化钠溶液
C.NaCl(Na2CO3) 硝酸钠
D.CaCl2溶液(HCl)氢氧化钾溶液