要使直线2x-3y+3=0和4x―ky-4=0平行,则k等于()
A、-3
B、3
C、6
D、-6
参考答案:C
The new bike is _____.It belongs to ________.
mine hers B. his his C.yours your D. mine me
据2010年全国地表水国控监测,长江、黄河、珠江、松花江、淮河、海河和辽河七大水系总体为()。
A.重度污染
B.轻度污染
C.无污染
D.极度污染