【判断题】制约和决定项目生产规模的关键因素是资金和基本投入物因素。( )
【简答题】基于不同的来源,斯威勒尔将认知负荷分成了 ( ) 、 ( ) 和 ( ) 三种。
【单选题】The writer states that, until recently, Americans thought of their country as a ______.
A.
source of enlightenment
B.
leader in technological progress
C.
recipient of a European heritage
【简答题】We thought that he is a (journal) ______, but he actually is a writer.
【单选题】The man sitting in his car thought the writer and her husband finished shopping in ten minutes.
【简答题】解下列方程组. (1) 7x+5y ① y=x+3 ② (2) 3x-2y=5 ① x+2y=13 ② (3) 2(x+1)-3(y-1)=10 ① 2(x+1)+7(y-1)=20 ② (4) 2x-y 5 = x+y 3 =3 (5) 3(x-1)-2(2y-1)=7 ① x+2 3 - 1-y 2 =2 ② (6) 25x+17y=91 ...
【简答题】如图,DE ∥ BC,DB=2,AE=1,AD=x,EC=y,则y与x之间的函数关系为______.
【简答题】若x、y满足 0≤x≤2 0≤y≤2 x-y≥1 ,则(x-1) 2 +(y-1) 2 的取值范围是______.