10. Sandy could do nothing but ____________ to his teacher that he was wrong.
A. admit
B. admitted
C. admitting
D. to admit
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进行需求分析可使用多种工具,但( )是不适用的的。
A. 层次方框图
B. PAD图
C. 状态转换图
D. IPP图
7. I don't remember __________ a chance to try this method.
A. to have been given
B. to be given
C. giving
D. having been given
函数f(x,y)在有界闭区域D上的二重积分存在的必要条件是f(x,y)在D上连续。
A. 对
B. 错
下列串行通信传输方式中,传输距离最远的是
A. TTL电平信号
B. 调制信号
C. RS-232信号
D. RS-485信号