【简答题】计算和化简求值 (1)已知:|a|=3,b 2 =4,ab<0,求a﹣b的值. (2)已知:A﹣2B=7a 2 ﹣7ab,且B=﹣4a 2 +6ab+7, ①求A等于多少? ②若|a+1|+(b﹣2)2=0,求A的值. (3)已知A=by 2 ﹣ay﹣1,B=2y 2 +3ay﹣10y﹣1,且多项式2A﹣B的值与字母y的取值无关,求(2a 2 b+2ab 2 )﹣[2(a 2 b﹣1)+3ab 2...
【简答题】用总体部分数值与总体全部数值之比求得的综合指标称为结构相对数,用总体中两个部分之比求得的综合指标称为( )。
【单选题】It was in writing The Spanish Tragedy that W. Shakespeare set up the pattern for the revenge tragedy.
【判断题】本节介绍的印章异类读法是右上为1,左下为2,右下为3,左上为4。()
【单选题】We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).
【单选题】第 12 题(本题:1分) 关于C语言的变量,以下叙述中错误的是
B.
所谓变量是指在程序运行过程中其值可以被改变的量
【简答题】Our tragedy today is a general and universal physical fear so long sustained by now that we can even bear it. There are no longer problems of the spirit. There is only the question: when will I be blo...
【单选题】机房建筑提供的吊钩,应确认其可靠和荷重力应( )被起吊物的重量。