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【单选题】
[普化1] 下列对于功和热的描述中,正确的是哪个?( )A.
都是途径函数，无确定的变化途径就无确定的数值
B.
都是途径函数，对应一状态有一确定值
C.
都是状态函数，变化量与途径无关
D.
都是状态函数，始终态确定，其值也确定
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【简答题】下面关于OD260/OD280比值的应用阐述哪一条是正确的?( ) A DNA样品的OD260/OD280比值大于1.8时,说明样品纯度高; B DNA样品的OD260/OD280比值大于1.8时,说明样品不纯,有蛋白质污染; C RNA样品的OD260/OD280比值大于1.8时,说明样品纯度高; D RNA样品的OD260/OD280比值大于1.8时,说明样品不纯,有蛋白质污染;
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【单选题】—I will take part in the quiz show next week. —_________.
A.
I will so
B.
So I will
C.
So will I
D.
I will
【简答题】____表示某时钟和标准时钟的频率偏差,两个不同节点的时钟频率偏差等于Cp(t)’- Cq(t)’。
【简答题】OD反推是()
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