题目内容

Which one of the following chemicals was used by Dr. Joseph Lister to reduceinfection during surgery in 1867 ?

A. surfactants,
B. heavy metals,
C. phenol ,
D. alcohol

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Which type of the halogens is used in toothpaste to prevent dental caries?

A. iodine,
B. chlorine,
C. bromine,
D. fluorine.

Which of the following disinfectants is used to kill anaerobes in deep puncturewounds?

A. iodine,
B. ethylene oxide,
C. Oxidizing agents,
D. 75% alcohol

Which level of Biosafety is the most secure , allowing work with dangerous microbes that cause severe or fatal diseases in humans, such as Ebola?

A. Biosafety Level –1;
Biosafety Level --2
C. Biosafety Level –3;
D. Biosafety Level --4

A sterile object is one free of all microbial forms, but bacterial spores can be present.

A. 对
B. 错