芽胞与细菌有关的特性是（）。
A.抗吞噬作周
B.产生毒素
C.耐热性
D.黏附于感染部位
E.侵袭力
参考答案：C
–It’s said that we'll have a ________ the coming May Day. – That’s so good.
A．three-days holiday
B．three-days' holidays
C．three-day holiday
D．three-days' holiday
孔隙率n是土样中的孔隙体积占土样总体积的百分率。
