为防止钢丝绳托磨枕木，在倾斜轨道中间设托绳轮，间距一般为（）。
A、12m
B、13m
C、14m
D、15m
参考答案：D
The building was purchased and by its new owner last year. [ ]
A. occupied
B. lived
C. resided
D. settled
二进制整数00111101转换成十进制数为
A．57
B．59
C．61
D．63
