My grandmother is coming from Nanjing and I'm going to the airport to .
A:pick her up
B:see her off
C:ring her up
D:wake her up
判断两根钢条甲和乙是否有磁性时,可将它们分别靠近一枚小磁针。当钢条甲靠近时,小磁针自动远离;当钢条乙靠近时,小磁针自动接近,由此可知( )
用托盘天平称量10g某物质时,如果天平指针偏向左,则需要( )