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【单选题】
以下指令中，实现通过P1引脚进行输出操作的指令是( )A.
a=P1&0x0f;
B.
if(P1==0xff);
C.
a=P1;
D.
P1=0xff;
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【简答题】对 20 个记录进行归并排序时,共需进行 趟归并,在第三趟归并时是把最大长度为 的有序表两两归并为长度为 的有序表。
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【简答题】用以下单词或短语填空 put up, put out, put on, put down, put off I my coat and left the house.
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【简答题】对20个记录进行归并排序时，共需要进行（）趟归并，在第三趟归并时是把长度为（）的有序表两两归并为长度为（）的有序表。
【单选题】I put my coat on and ___ a look in the mirror.
A.
had been taking
B.
took
C.
was taking
D.
had taken
【简答题】对20个记录进行归并排序,共需进行( )趟归并,在第三趟归并时把长度为( )的有序子表两两归并成长度为( )的有序子表。
【简答题】对20个记录进行合并排序时，共需要进行________趟归并。
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