二次函数y=kx2-6x+3的图象与x轴有交点，则k的取值范围是[ ]
A.k<3
B.k<3且k≠0
C.k≤3
D.k≤3且k≠0
答案：D
—You are a good girl. You dealt with the thing well.
—Thank you.[ ]
A. even
B. such
C. probably
D. fairly
对乙烯样品进行全分析时（）采样。
A.可用球胆
B.一定要用钢瓶
C.用玻璃瓶
D.用塑料瓶
