题型:判断题 — Did you hear about the air crash? I feel so lucky!— Yes, If you _____ that flight, I _____ speaking to you now. [ ]A. were taking; wouldn't be B. took; wouldn't have beenC. had taken; wouldn't be D. had taken; wouldn't have been 查看答案
题型:判断题 一种液体的密度随深度而增大,它的变化规律是ρ=ρ0+kh,式中ρ0、k是常数,h表示深度.设深度足够,有一个密度为ρ′的实心小球投入此液体中,且ρ′>ρ0,则正确的判断是( )A.小球将一沉到底,不再运动B.小球将漂浮在液面,不能下沉C.小球经过一段运动过程,最终悬浮在深h=ρ′-ρ02k处D.小球经过一段运动过程,最终悬浮在深h=ρ′-ρ0k处 查看答案