题目内容

一直立水坝中有一矩形闸门,宽10m,深6m,g是重力加速度,当水面在闸门顶上8m时闸门所受水的压力是( )kN

A. 180g
B. 300g
C. 660g
D. 760g

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The time it takes one bacterium to become two bacteria is referred to as

A. the culture doubling time
B. the generation time
C. the mass doubling time
D. the incubation time
E. None of the above

Most pathogenic bacteria are

A. obligate aerobes
B. facultative anaerobes
C. microaerophiles
D. obligate anaerobes
E. None of the above

The growth rate of bacteria during the exponential phase of growth is

A. Zero
B. Increasing
Constant
Decreasing
E. Negative

The ability to use compounds and ions other than oxygen as terminal oxidants in respiration is a widespread microbial trait. This capacity is called

A. Photosynthesis
B. Fermentation
C. Anaerobic respiration
D. Substrate phosphorylation
E. Nitrogen fixation

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