CO、H2、CH2、C2H2、CO2是可燃气体。
参考答案：错
在区间乘降所错误通过，定（）单位责任。
A、车长
B、机务
C、值班员
D、调度
John applied for the post of Eliot's secretary. Does he __________ the necessary patience and ability
to do the job well?[ ]
A. perform
B. possess
C. observe
D. support
