A _______ place means there isn't anything or anybody to live or grow at all.
A:lively
B:worthless
C:lifeless
小明在完成“动手动脑学物理”时,认识了密度计.将其放入液体中,当它竖立静止时,密度计的读数即为待测液体的密度.
计算:
请你说明为什么要弘扬宪法精神?