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单选题 When collecting air microbial samples using the direct sedimentation method, how long is the agar plate usually exposed to the air? ( )
学科：默认课程
时间：2025-10-19 04:24:10
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题目1单选题
When determining the total number of colonies in the air, what is the appropriate temperature range for culturing general bacteria and the total number of bacteria? ( )A. 25℃~27℃B. 30℃~31℃C. 31℃~32℃D. 35℃~37℃
题目2单选题
When testing for streptococci in the air, which medium should be used instead of the ordinary nutrient agar plate? ( )A. Potato Agar MediumB. Blood Agar PlateC. Corn Meal Agar MediumD. Tryptic Soy Agar Medium
题目3单选题
Which of the following microorganisms belongs to the group that survives for a relatively long time in the air? ( )A. Escherichia coliB. BacillusC. Lactic acid bacteriaD. Bifidobacterium
题目4单选题
According to the "geographical distribution of microorganisms in the air" data in the document, which region has the highest number of bacteria in the air? ( )A. Livestock houseB. Urban streetC. ParkD. Sea surface
题目5单选题
What is the standard for the settling bacteria count in the clean production area (air cleanliness class 1000/10000) of a food factory? ( )A. <10 pc/m³B. <30 pc/m³C. <50 pc/m³D. <100 pc/m³
题目6单选题
When collecting air microbial samples using the direct sedimentation method, how long is the agar plate usually exposed to the air? ( )A. 1~3 minB. 5~10 minC. 15~20 minD. 20~30 min
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