You know him.I know him,______. [ ]
A. some
B. any
C. too
D. either
答案:C
A.,正电荷
B.,正电荷
C.,负电荷
D.,负电荷
物料提升机附墙可采用()与架件及建筑连接
A、木杆
B、竹杆
C、钢丝绳
D、钢管