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【单选题】
当8253的控制线引脚WR=0,A0=1,A1=1,CS=0时,完成的工作为__________。
A.
写计数器0
B.
写计数器1
C.
写计数器2
D.
写控制字
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【单选题】数字字符2的ASCII码为十进制数50,数字字符5的ASCII码为十进制数()。
A.
52
B.
53
C.
54
D.
55
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A.
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B.
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C.
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D.
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【单选题】数字字符2的ASCII码为十进制50,数字字符5的ASCII码为十进制()
A.
52
B.
53
C.
54
D.
55
【单选题】数字字符2的ASCII码为十进制数50,数字字符5的ASCII码为十进制数()。
A.
52
B.
53
C.
54
D.
55
【简答题】I had great difficulty ________ the doctor as his phone was busy.
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