A:中学生平时上楼的功率约为1000W
B:适合人游泳的水温约为70℃
C:一个鸡蛋的质量约为50g
D:考试用的中性笔长约15dm
____ ____family____a dog?
我国秦岭—淮河、青藏高原东南边缘一线的年降水量是( )
—I don't know the _______. Maybe you can ask his good friend Simon.