计算:a2•a3÷a4的结果是______.
a2•a3÷a4=a2+3-4=a,
故答案为:a.
----- Tom has won the first prize in the singing contest of our school.
------- __________ .You see he always works hardest.
A.He is a lucky dog
B.No pains , no gains
C.All roads lead to Rome
D.It is no use reasoning with a fool.
业务经理实行报告制度,业务经理履职报告包括()。
A、工作日志
B、月报
C、年报
D、聘期届满报告
E、旬报