21号染色体的三体引起的畸形称为（）。
参考答案：先天愚型（Down综合征）
Sorry, I’ve ________ you. I thought you were finding _____ with me.
A．mistaken; fault
B．mistook; error
C．faulted; mistake
D．mistake; wrong
1、2号机轴向位移保护定值是多少？
