第24题: [单项选择]设PC机中单字节带符号的整数:A=01001010,B=10100011,则A-B的结果是______。 A. 10100111 B. 10100111 C. 11010001 D. 00101101 参考答案:A 答案解析:[解析] 两个带符号的整数减法是先把减数变号,然后再与被减数相加即可。将减数的每一个二进制变反,然后在最末位加1,可得01011101,再与01001010相加,最后结果为 10100111。
第28题: [单项选择]Not until the advent of histochemistry could the anatomist see through the microscope which cells carry specific enzymes or gauge how active these enzymes are in different cells under various conditions. A. discern B. grasp C. measure D. estimate 参考答案:C 答案解析:gauge测量。A.discern目睹;B.grasp抓住;C.measure测量;D.estimate估计。