下列省区中，有两个简称的是[ ]
A．湖北、贵州、河南、河北
B．云南、甘肃、上海、陕西
C．湖南、湖北、重庆、四川
D．江苏、江西、浙江、青海
答案：B
When you get the paper back, pay special attention to what . [ ]
A. have marked
B. have been marked
C. had marked
D. had been marked
电机启动次数的要求？
