I've got one test there, and then I've just got one thing to do here, which has got a subtraction and a multiplication.
这儿有一个比较,然后在一个基本步骤里,做了一个减法和一个乘法两个基本操作。
Same sort of subtraction problem, what do we have for the ionization energy of the 2 s electron?
进行类似的减法运算,得到的,2,s,电子的电离能应该是多大呢?
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