夹具中不能起到的作用（）
A.减少工序
B.保证加工精度
C.提高生产率
D.减轻工人劳动强度
参考答案：A
一 Excuse me. I want to buy some stamps, but I can't find a post office.
一 I know _____ nearby. Come on, I'll show you. [ ]
A. one
B. it
C. that
D. any
治疗霍乱首选为
A．抗菌药物B．禁食C．血管活性药D．补液E．抗毒素治疗
