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- 题目分类：英语四级
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学生学习了杠杆的概念，知道了杠杆的力臂原理，而后他们学习滑轮，知道定滑轮实质上是一种等臂杠杆，这种同化模式属于（ ）。
学生学习了杠杆的概念，知道了杠杆的力臂原理，而后他们学习滑轮，知道定滑轮实质上是一种等臂杠杆，这种同化模式属于（ ）。A．上位学习 B．下位学习 C．并列学习
In science museums today， people no longer feel strange in t
In science museums today， people no longer feel strange in the world of science
They have been tightening their belts for months, adapting t
They have been tightening their belts for months, adapting themselves to a war e
They tried their best to resolve the residual problems.
They tried their best to resolve the residual problems.A．A domestic B．B remainin
A expensiveB dear C invaluableD valuable
A expensiveB dear C invaluableD valuable