题型:问答题 —I will take an important test tomorrow. —Oh, really? _______!A.Good luckB.Have a good timeC.Well doneD.Good idea 查看答案
题型:问答题 货运机车的阶段制动作用中,减压量与制动缸压力对应正确的是()A.减压量40~60Kpa,制动缸压力80~150KpaB.减压量100Kpa,制动缸压力200~230KpaC.减压量140Kpa,制动缸压力330~360KpaD.减压量170~190Kpa,制动缸压力330~360Kpa 查看答案