—I agree. Trees are getting now.
A:from, fewer and fewer
B:for, more and more
C:for, less and less
D:from, more and more
在平直的公路上,一辆汽车正以20m/s的速度匀速行驶,所受阻力为5×103N.因前方出现事故,司机立即刹车,直到汽车停下,已知汽车的质量为3×103kg,刹车时汽车所受的合力为1.5×104N,求:
矩阵M =100-1对应的变换是( )
①浓盐酸 ②浓硫酸 ③氢氧化钠溶液 ④食盐溶液 ⑤石灰水 (填序号)