新的高中历史课程标准把课程目标分解成三个层面,即()。①知识与能力②过程与方法③情感态度与价值观④运用和理解
A.①③④
B.②③④
C.①②③
D.①②④
参考答案:C
981型应急电源箱充电机充电电流为()
A.20A
B.5A
C.10A
D.2A
When household incomes go down and the quantity of a product demanded goes up, the product is:()
A. an inferior good.
B. a necessity.
C. a luxury good.