单项选择题在多电子原子中,各电子具有下列量子数,其中能量最高的电子是( ) A.2,1,~1,1 2 B.2,0,0,-1 2 C.3,1,1,-1 2 D.3,2,-1,1 2
单项选择题Expenses are often called the , that is, the cost of the various activities necessary to carry on a business. A. costs of doing business B. costs of business C. salaries D. utilities