函数$f\left(x\right)=\left\{\begin{array}{c}2x^2-8ax+3\left(x<1\right)\\ {\log }_{a}x\left(x\ge 1\right)\end{array}\right.$满足对任意$x_1\ne x_2$，都有$\frac{f\left(x_1\right)-f\left(x_2\right)}{x_1-x_2}<0$，则a的取值范围(   )

认识自我有很多途径，下列方法正确的是（    ）

    There're five members in my family—my parents , my grandparents, and me . My mother is a teacher. She teaches Chinese in our school. She likes music. My father is a teacher, too. He teaches art in the Guang Ming primary school. He likes going hiking. My grandmother is a worker. She likes reading books. My grandfather is a scientist. He likes playing chess. I am Betty. I'm in Shi Yan primary school. I like singing and dancing. Look! I have a happy big family. Isn't it?

人的胚胎干细胞有46条染色体，以色列科学家利用胚胎干细胞成功的制造出了心脏细胞，请问，制造出的心脏细胞有多少条染色体？（  ）