【单选题】I looked under ______ table and found ______ pen he lost the day before yesterday. [ ]
【简答题】将文件指针fp从文件末尾处向后移个字节,正确的函数操作是
【单选题】When Helen saw her tutor nod ________ to her, she calmed down and went on with her performance. [ ]
【单选题】When Helen saw her tutor nod _______ to her, she calmed down and went on with her performance.
【单选题】Helen apologized for ______ to attend the party.
【多选题】A/D转换是数据采集的第一步,就是选择合适的A/D转换芯片,将传感器送来的模拟信号,转换成数字信号,以便于单片机、PC机等进一步运算处理。通常选择A/D转换芯片时,需要考虑()。
A.
位数。如8位、10位、12位等,它体现的是将一定的模拟信号转换成相应位数的二进制数据。
B.
转换速度。衡量采集数据的速度,通常用一秒钟可以进行的转换次数来衡量,如1M SPS ,表示一秒钟可以进行1M,即1百万次转换。
【单选题】Is this factory _____ you and your mother visited the day before yesterday? [ ]
【简答题】The day before the day before yesterday is three days after Saturday. What day is it today?
【单选题】______ before we depart the day after tomorrow, we should have a wonderful party.