下列哪种激励方式对老员工不管用，但对年轻员工却非常有效（）
A.工作扩大化
B.增加薪资
C.股票期权
D.晋升留人
参考答案：A
单词拼写。
1. That woman is my aunt. brother is my father.
2. My father calls her sister and I call her .
3. My mother calls him brother and I call him .
4. His father's mother is his .
5. Mary is David's sister and David is her .
慢性阻塞性涎腺炎的主要造影表现是（）
A.主导管扩张
B.主导管呈花边状、羽毛状葱皮状
C.末梢导管扩张
D.腺泡充盈缺损
