Tony Green has worked very hard to make his dream a(n) ________(real).
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Nothing can ________ (gain) without risk.
It is not that _______ (help) in learning English to study grammar only.
移位寄存器中的一级是由下面的哪一项组成?( )
A. 计数器
B. 译码器
C. 触发器
D. 加法器
为了将1字节数据串行移位到移位寄存器中,必须有( )。
A. 1个时钟脉冲
B. 8个时钟脉冲
C. 1个置数脉冲
D. 1个复位脉冲