【判断题】入射孔径角是指入射光瞳半径两端对物平面与主轴的交点所张的角。
【判断题】如果采购订单数量10件,入库时合理损耗1件,实际入库数量9件,则采购发票的数量应为9件。
【多选题】一组数据为1,3,4,6,7,8,10,12,13,14,16,17,103。请问下列哪个集中量数适合描述这组数据的集中趋势?
【单选题】某企业2011年10月10日成立,从业人员50人,11月11日录用9人,12月12日解聘6人。请根据上述资料,回答下列问题:该公司全年平均人数为()。
【单选题】Some useful ideas were suggested while the social committee was ______ about the clubs program for the coming season.
【单选题】Pro-social games enable participants to
A.
skillfully accomplish the required tasks.
B.
select medium puzzles for their partner.
C.
be integrated into different social groups.
D.
conduct helping actions to their partner.
【简答题】请观察下列算式,找出规律并填空 1 1×2 =1- 1 2 , 1 2×3 = 1 2 - 1 3 , 1 3×4 = 1 3 - 1 4 , 1 4×5 = 1 4 - 1 5 则第10个算式是______=______, 第n个算式为______=______. 根据以上规律解答下题: 若有理数a,b满足|a-1|+(b-3) 2 =0,试求: 1 ab + 1 (a+2)(b+2) + 1 ...
【简答题】请观察下列算式,找出规律并填空. 1 1×2 =1- 1 2 , 1 2×3 = 1 2 - 1 3 , 1 3×4 = 1 3 - 1 4 , 1 4×5 = 1 4 - 1 5 (1)则第10个算式是______=______, (2)第n个算式为:______=______. (3)根据以上规律解答下题: 若有理数a,b满足a=1,b=3,试求 1 ab + 1 (a+2)(b+2) + 1...
【简答题】s who interact with their parents on social networking sites have higher rates of “pro-social” behavior. _______