【多选题】明清时,从美洲传入我国的农作物有( )。
【单选题】Who knocked at Jane's door?
【判断题】( )ZN~10型真空断路器大修调整后,相间中心距应控制在200±10mm范围内。
【简答题】Jane was hit on the head by the robber and was knocked ________. A) mindless B) unconscious C) brainless D) unaware
【判断题】增强型PMOS管的开启电压大于零。( )