Max walked for 10 minutes before he asked somebody for help.
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The first person Max asked in the street could not help Max because he was a stranger there.
A. 对
B. 错
A policeman could help him.
A. 对
B. 错
The policeman told him to go back to the dock.
A. 对
B. 错
两个原码表示的数相乘时，乘积的符号位是通过两数符号位相（ ）运算得到。
A. 与
B. 或
C. 异或
D. 同或
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