高压蒸汽灭菌采用的温度和时间是()。
A.121℃,15-20分钟
B.160℃,2-3小时
C.100℃,15-20分钟
D.132℃,1-2秒钟
参考答案:A
(2012•绍兴)下列实验操作中,正确的是( )
Mr. Smith was in great need of money, so he ____ $2 000 for his car.
A.paid
B.took
C.cost
D.spent