Look at me. This is my .
A:head
B:body
C:hand
“I saw him crossing the street.” The sentence structure is ______.
在等差数列an中,若a4=13,a7=25,则公差d等于( )
我国“蛟龙号”已实现下潜深度7062m,其下潜过程中,潜水员的质量____,“蛟龙号”受到水的压强____。(选填“变大”、“变小”或“不变”)