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Which of the following methods can destroy all microbial forms including endospores most efficiently?
A. boiling water;
B. autoclave;
C. pasteurization;
D. 75% alcohol
Which of the following parameters is right in hot air sterilization?
A. 160 ℃ /2hrs ;
B. 160℃/1hrs ;
C. 120℃/1hrs;
D. 100℃/2hrs;
Which of the following parameters is right in autoclaving sterilization?
A. 111.3℃, 1.05kg/cm2, 15-20min, ;
B. 160℃,1.05kg/cm2,15-20min,
C. 120 ℃, 1.05kg/cm2, 1hrs;
D. 121.3℃,1.05kg/cm2,15-20min,
Which statement about autoclaving is not right?
A. Pressure is applied to boiling water to prevent the escape of heat in steam ;
B. It is the most efficient sterilization method.
C. Objects sterilized should tolerate moist heat.
D. Killing endospore needs more time than killing bacterial cells.
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