—Whatever the result is, don't be too hard on yourself.
A:how have I prepared for my final exams
B:whether I can get great grades in the final exams
C:that my school team lost the game because of my fault
D:why did my school team lose the game
关于光合作用和化能合成作用的叙述,正确的是( )①与异养生物有关 ②都将CO2和水合成为有机物③都属于自养生物的营养方式 ④合成有机物所利用的能量相同
重为G的正方体静止在水平面上,若在该正方体上表面的中央施加一个竖直向上的力,其大小为F(F<G),此时该正方体在竖直方向上所受合力的大小为( )