单项选择题
The lag phase of bacterial growth:( ).
a)Is a period of active multiplication
b)Involves adaptation to a new environment
c)Occurs between the exponential phase and the stationary phage
d)Is not influenced by environmental factors
e) Is constant in duration
A、a only
B、b only
C、c only
D、d and e
E、a and e
The lag phase of bacterial growth:( ).
a)Is a period of active multiplication
b)Involves adaptation to a new environment
c)Occurs between the exponential phase and the stationary phage
d)Is not influenced by environmental factors
e) Is constant in duration
A、a only
B、b only
C、c only
D、d and e
E、a and e
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关于准确度和精密度的关系,下列说法准确的是
关于准确度和精密度的关系,下列说法准确的是
A.准确度和精密度没有关系
B.高精密度是高准确度的前提,但高精密度不能一定保证高准确度
C.精密度高,准确度也就高
D.精密度低,也可以获得高的准确度
单项选择题
反应CH3COOH(l)+C2H5OH(l)=CH3COOC2H5(l)+H2O(l)在25℃平衡常数Kc$为4.0,今以CH3COOH及C2H5OH各1 mol混合进行反应,则达平衡常数最大产率为
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A.66.7%
B.0.334%
C.50.0%
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