We had a heated discussion in a relaxed ____(气氛)yesterday.
有关非洲位置的叙述,错误的是( )
测定种子的发芽率时,应当提供的环境条件除了适宜的温度、一定的水分外,还需要____.测发芽率时应当尽量挑选个大的种子吗?____.
——We can't get good grades ______ we study harder.——I agree. That's why I study so hard.
请用恰当的化学用语表示