题型:名词解释 28. It is only when agriculture is fully developed___________industry can have abundant materials and markets.A.thatB.whenC.beforeD.Until 查看答案
题型:名词解释 A.条件(1)充分,但条件(2)不充分.B.条件(2)充分,但条件(1)不充分.C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.D.条件(1)充分,条件(2)也充分.E.条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.非零实数,x,y,z满足。(1)x:y:z=3:2:1; (2)z=-3x+5y. 查看答案