经查定,自动闭塞区段I追=7min、I到=7.2min、I发=7.8min、I通=8.1min,该区间追踪列车间隔时间I应取值为()。
A. 7min
B. 8.1min
C. 8min
D. 9min
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普通客车的人力制动机,其换算闸瓦压力为()。
A. 40kN
B. 50kN
C. 60kN
D. 80kN
A person being treated for shock should be wrapped in warm coverings to().
A. increase body heat
B. preserve body heat
C. avoid self-inflicted wounds caused by spastic movement
D. protect the person from injury during transportatio
东方红推土机4125发动机气缸套与活塞裙边部间隙超过()mm时应修理或更换。
A. 0.35
B. 0.45
C. 0.55
D. 0.65
防治种子传染病害和地下害虫时,拌种用的药量一般为种子重量的()为宜。
A. 0.1%至0.5%
B. 0.2%至1.0%
C. 0.3%至1.5%
D. 0.4%至2.0%