单项选择题

TCH的复帧有 26 个TDMA帧，而用于映射BCH和CCH的复帧有 51 个TDMA帧；( )

A．对
B．错

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单项选择题

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单项选择题

The effect of temperature on the rate of enzymatic reaction is
A、When the temperature rises, the reaction rate increases, which is exactly the same as that of ordinary catalysts.
B、Low temperature may denature the most enzymes.
C、The optimum temperature is the characteristic constant of enzyme and is not related to the reaction time.
D、The optimum temperature is not the characteristic constant of enzyme. The longer the reaction time, the lower the optimum temperature.
E、All enzymes have the same optimum temperature.