— .
A:I like monkeys.
B:I like Chinese.
C:I don't like PE.
已知P为边长为2的正方形ABCD及其内部一动点,若△PAB,△PBC面积均不大于1,则AP→·BP→取值范围是( )
It's easy to make mistakes with English words.
某同学连接如图所示电路研究电磁铁的磁性,为了让铁钉吸引大头针的数目增多,以下措施中可行的是( )