按《接触网运行检修规程》规定:测量线岔的周期为()个月。
Compass error is equal to the().
A. deviation minus variation
B. variation plus compass course
C. combined variation and deviation
D. difference between true and magnetic heading
伴热蒸汽应从供汽主线上方引下,蒸汽压力保持稳定,一般不小于()。
A. 0.2~1.0Mpa
B. 0.3~1.0Mpa
C. 0.4~1.0Mpa
D. 0.5~1.0Mpa