The Chairman asked me to my speech to 20 minutes. [ ]
A. make
B. give
C. limit
D. explain
C
急性肾衰少尿期死因多是
A.高血钾B.碱中毒C.肺水肿D.钠潴留E.心衰
PVA罗茨风机的保护有()保护。
A、过流
B、速断
C、零序
D、欠压
E、联琐