Let’s ________ together. [ ]
A. go to home
B. to go to home
C. go home
D. to go home
答案:C
写出命题“两直线平行,内错角相等”的逆命题:______.
长江航道两旁城市相距240km,一艘轮船顺流而下需4h,逆流而上返回需6h,设船在静水中速度为xkm/h,水速为ykm/h,依题意列方程组( ).