The homework for the chemistry lessons today is to balance 20 chemical reaction equations.
今天的化学作业是配平这20个化学反应式。
Consider the chemical reactions described earlier. Word equations are a useful way of describing these chemical reaction.
考虑到先前描述过的化学反应,方程序是描述这些化学反应的一种有用的方式。
Consider the chemical reactions described earlier. Word equations are a useful way of describing these chemical reaction.
考虑到先前描述过的化学反应,方程序是描述这些化学反应的一种有用的方式。
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