【简答题】He _____ the er of driving after
drinking wine.A. has
warned of B. has
warned C. has
been warned D. has
been warned of
【判断题】叉车连续启动时间过长将造成蓄电池大量放电和启动机线圈过热易损坏机件。( )
【单选题】Richard __________ injured in the car crash,but I didn’t stop him driving after he drank some beer.
【简答题】地面空气进入矿井后,其成分和性质发生哪些变化?