电力系统供电除可靠性外,电能的质量、指标,还包括()。
A. 电压及对称性
B. 频率
C. 波形
D. 发电机阻抗
E. 电动机Y-△运行
查看答案
Manila lines in which the strands are right-hand laid().
A. should be coiled in a clockwise direction
B. should be coiled in a counterclockwise direction
C. may be coiled either clockwise or counterclockwise
D. should never be coiled
CNG加气站的低压脱水又称()脱水。
A. 压缩机末级出口
B. 压缩机中间级
C. 压缩机前置
D. 加气机出口