通常采用MB(兆字节)作为PC机主存容量的计量单位,这里1MB等于( )字节。
A.210
B.220
C.230
D.240
参考答案:B
What do you _____________ for lunch?[ ]
A. have
B. has
C. had
售货员的操作技术,“准”必须做到哪三个坚持?