【单选题】《幼儿园工作规程》指出,幼儿园应制定合理的学前儿童一日生活作息制度,两餐间隔时间不少于()
【单选题】What is the main idea of the passage?
A.
The proportion of boys being born is dropping.
B.
Single mothers are more likely to have daughters.
C.
Cohabitation is the decisive factor for newborns' sex.
D.
Both mothers and fathers are involved in parental care.
【单选题】测定下列哪种酶的活性可以辅助诊断急性肝炎?()
【多选题】下列行为,哪种符合读者文明公约的行为?( )
D.
大声喧哗、大声接打电话、吃零食、长时间占座位等
【单选题】应用虚功原理,在求解结构在外因作用下A截面在竖直方向的线位移时,其虚拟状态的单位力为: