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【单选题】
How does the great power system of the twentieth century compare with that of the eighteenth and nineteenth centuries?A.
The great power system in the twentieth century was global, whereas the great power system in the eighteenth and nineteenth centuries was European.
B.
The United States dominated the great power system of the twentieth century, whereas France dominated the great power system of the eighteenth and nineteenth centuries.
C.
The Concert of Europe was a feature of the great power system of the twentieth century, whereas the great power system of the eighteenth and nineteenth centuries saw constant conflict in Europe.
D.
World Wars I and II were major conflicts in the great power system of the twentieth century, whereas the great power system of the eighteenth and nineteenth centuries saw no major conflicts as Britain served as an effective balancer.
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【简答题】【图片】如上图所示电路，已知电路的当前状态Q3 Q2 Q1 Q0为“1100”，74LS191具有异步置数的逻辑功能，请问在1个时钟作用下，电路的下一状态（Q3 Q2 Q1 Q0）为（请直接填入0或者1的序列）：
【单选题】【图片】如上图所示电路，已知电路的当前状态Q3 Q2 Q1 Q0为“1100”，74LS191具有异步置数的逻辑功能，请问在时钟作用下，电路的下一状态（Q3 Q2 Q1 Q0）为：
A.
1100
B.
1101
C.
0000
D.
1011
【单选题】电路如下图,已知电路的当前状态 Q 3 Q 2 Q 1 Q 0 为“ 1100 ”, 74LS191 具有异步置数的逻辑功能,请问在时钟作用下,电路的下一状态( Q 3 Q 2 Q 1 Q 0 )为( )
A.
1100
B.
1011
C.
1101
D.
0000