预真空压力蒸汽灭菌器的装载量不得小于柜室容积的
A．5%B．10%C．15%D．20%E．25%
参考答案：B
Thomas Alva Edison didn’t “invent” the light bulb, but rather he ______ a 50 –year –old idea, which is not well –known.
A．improved upon
B．take down
C．put up
D．break away
秦朝三公九卿和郡县长官产生的方式是（）
A.世代相袭
B.考试选拔
C.地方推荐
D.皇帝任命
