A:30x2=36.3
B:30(1-x)2=36.3
C:30+30(1+x)+30(1+x)2=36.3
D:30(1+x)2=36.3
下列生理过程中需要消耗细胞代谢产生的能量的是( )
— She should cheer up. A dead heart is much _______ than sadness.
浮力计算的普遍公式是( )