10. Rather than trying to negotiate treaties that outlaw such behavior, America should ____________.
A. lead by example
B. let oneself go
C. strike it rich暴富
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11. Wenchuan was _________ a massive earthquake on May 12, 2008. After that, many people volunteered to donate money and other necessary things.
A. constrained to
B. stricken by
C. harassed by
计数器也可以作为使用。
A. 存储器
B. 分频器
C. 加法器
D. 寄存器
74LS194是由4个触发器组成的功能很强的4位移位寄存器。
A. 8位移位寄存器
B. 4位移位寄存器
C. 8位同步计数器
D. 4 位同步计数器
74LS194是在输入时候,能实现数据右移寄存,且DSR为串行输入,Q3为串行输出。
A. R=0、Sl=0、S0=0
B. R=0、Sl=1、S0=0
C. R=1、Sl=0、S0=1
D. R=1、Sl=1、S0=0