根据《华润置地物业服务细节》物业服务人员身着工服在园区行走时，须（）人成行（）人成列。
A.三、二
B.二、三
C.三、四
D.二、四
参考答案：B
As a result of the serious flood, two-thirds of the buildings in the area _____. [ ]
A. need repairing
B. needs to repair
C. needs repairing
D. need to repair
厘米波电疗仪()中波电疗仪()毫米波电疗仪()
A．频率1.63MHz
B．频率27.12MHz
C．频率2450MHz
D．频率37.5GHz
E．频率915MHz
