选择题:5. Some researchers believe that there is no doubt

题目内容:

5. Some researchers believe that there is no doubt ______ a cure for AIDS will be foun(本题1.0分)
A、 which
B、 that
C、 what
D、 whether
参考答案:

14. 单片机8051的XTAL1和XTAL2引脚是( )引脚。(本题3.0分)A、 外接定时器B

14. 单片机8051的XTAL1和XTAL2引脚是( )引脚。(本题3.0分)A、 外接定时器B、 外接串行口C、 外接中断D、 外接晶振

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