电费核算是电费管理的()环节,是为提高供电企业经济效益服务的。
A.基础
B.目的
C.中枢
D.最终
参考答案:C
Jack has got into _______ habit of collecting newspaper cuttings, which is _______ great joy for him.
A.\ ; a
B.a; the
C.the; a
D.the; the
胎怯的主要临床表现为()
A.体重低于2500克
B.身长小于45cm
C.气弱肢软
D.面色无华
E.指纹色淡