中胚叶造血开始于（）。
A.胚胎6周
B.胚胎3周
C.胚胎8周
D.胚胎5周
E.胚胎10周
参考答案：B
— Would you like to order the two robots?
— Yes, one is to help me with my homework, and ______ is for my mother to do housework.
A．another
B．the other
C．other
D．others
高压蒸汽灭菌法所用的条件是
A．0.8kg/cm2，105℃，10～15minB．1.05kg/cm2，121.3℃，15～30minC．1.05kg/cm2，125℃，10～15minD．1.5kg/cm2，121.3℃，15～30minE．1.5kg/cm2，125℃，15～30min
