After he () the test, the engineer put down the results.
A. has finished
B. finishes
C. had finished
D. would finish
列车操纵示意图上应包括线路纵断面和信号机位置。
A. 正确
B. 错误
给单节落后电池补充电过程中,连续测得的电解液密度在()g/cm3之间应无明显变化。
A. 1.19~1.20
B. 1.20~1.22
C. 1.22~1.24
D. 1.23~1.25
机车进入挂车线后,司机应严格控制速度,确认脱轨器、防护信号及停留车位置。
A. 正确
B. 错误