【单选题】当正态总体的方差未知时,在大样本条件下,估计总体均值使用的分布为( )
【简答题】听力原文:If a British person wants to borrow a pen, what will he say? If a British person wants to borrow a pen, what will he say? He will say,'______'.
【单选题】Why couldn't the man find the person he wanted?
A.
There was no person by the name.
B.
He dialed a wrong number.
C.
Mr. Hatton was out for dinner.
【判断题】苯酚分子的苯环上连有吸(拉)电子基团时酸性减小,连有给(供)电子基团时酸性增强。
【简答题】在 LED 封装过程中,列举五种 LED 固晶的失效模式。
【多选题】按计划成本分配法分配辅助生产成本时( )
【多选题】汽车天窗按结构形式可分为哪些? What kinds of automobile skylights can be divided into according to their structural forms?