用电信息采集系统采用GPRS通讯方式与无线电台相比较()。
A.抗干扰性强
B.成本非常高
C.系统容量小
D.网络自维护
参考答案:A
—Are Mr. and Mrs. Wang living alone in the house?
—Yes, altough they have three sons, ______ of them live with their parents. [ ]
A. neihter
B. both
C. all
D. none
绞孔直径在5~20mm之间时,绞削余量为()。
A.0√~0.2mm
B.0.3mm
C.0.5mm
D.0.2~0.3mm