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【单选题】
以下不属于接待咨询工作的基本要求是哪一项?A.
回复及时，用词简单
B.
引导提问，挖掘需求
C.
体察意图，多听
D.
引导下单，留有余地
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反馈参考答案：
举一反三
【简答题】干热灭菌的方法有哪些及其适用对象怎样？
【单选题】The status of nitrogen balance in pregnant women is as follows:
A.
intake of nitrogen = exhaust of nitrogen
B.
nitrogen intake > nitrogen output
C.
nitrogen intake < exhaust of nitrogen
D.
nitrogen intake ≤ nitrogen loss
E.
none of the above is true
【简答题】灭菌的方法有哪些？
【简答题】氮平衡(nitrogen balance)
【简答题】简述灭菌的方法有哪些?
【简答题】氮平衡(nitrogen balance)
【多选题】What is nitrogen cycle?
A.
In the biosphere, the metabolic processes of different species function interdependently to salvage and reuse biologically available nitrogen in a vast nitrogen cycle.
B.
The first step in the cycle is fixation (reduction) of atmospheric nitrogen by nitrogen-fixing bacteria to yield ammonia (NH 3 or NH 4 + ). Although ammonia can be used by most living organisms, soil bacteria that derive their energy by oxidizing ammonia to nitrite (NO 2 ˉ ) and ultimately nitrate ( NO 3 ˉ) are so abundant and active that nearly all ammonia reaching the soil is oxidized to nitrate. This process is known as nitrification.
C.
Plants and many bacteria can take up and readily reduce nitrate and nitrite to ammonia through the action of nitrate and nitrite reductases. This ammonia is incorporated into amino acids by plants. Animals then use plants as a source of amino acids to build their proteins. When organisms die, microbial degradation of their proteins returns ammonia to the soil, where nitrifying bacteria again convert it to nitrite and nitrate.
D.
A balance is maintained between fixed nitrogen and atmospheric nitrogen by bacteria that reduce nitrate and nitrite to N 2 under anaerobic conditions, a process called denitrification. These soil bacteria use NO 3 ˉ or NO 2 ˉ rather than O 2 as the ultimate electron acceptor in a series of reactions that (like oxidative phosphorylation) generates a transmembrane proton gradient, which is used to synthesize ATP.
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