13.955≈14，表示精确到十位．______．（判断对错）
13.955≈14，表示精确到个位；
故答案为：×．
My mother was so angry at ______ my brother was doing ______ she stopped him at once.[ ]
A. that, that
B. what, that
C. that, what
D. what, what
载波通信缺省波特率是（）
A、1200
B、2400
C、4800
D、9600
