消毒是指()
A.杀死细菌
B.杀死病毒
C.杀死芽胞
D.杀灭病原微生物
E.杀灭所有的微生物
参考答案:D
---I did very well in the Maths exam yesterday.
---I did _____ . I got full marks.
A.no better
B.no worse
C.even worse
D.not better
机械找正、地脚垫总厚度不应超过()。
A.1mm
B.2mm
C.3mm
D.4mm