单项选择题

An asynchronous counter is also known as a ripple counter.
A. 对 B. 错

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单项选择题

Julie is majoring in _______.

A．English and international affairs
B．English and world trade
C．English and business administration

不定项选择

核苷酸的从头合成和补救合成都需要PRPP。

A．正确
B．错误