题目

与主族元素在周期表中所处的位置无关的是 A.原子序数        B.核内中子数      C.电子层数       D.最外层电子数 答案：B选择与画线部分意思相同或相近的选项。 The teacher gave out the books to the students. [     ]A. gave up B. gave back C. handed out D. gave in