轨道车制动缸鞲鞴行程调整均应为80一100InIn。
参考答案：错
What you learn today ______ of practical use when you hunt for a job.
A．is proved
B．proves
C．will be proved
D．will prove
钢瓶内CO2减少（）时，应重新灌装。
A.10%
B.15%
C.20%
