胃痛发病的关键病机是
A．气虚
B．气怯
C．气陷
D．气滞
E．气逆
参考答案：D
纪念币是（）的限量发行的人民币。
A.具有特定主题
B.具有特殊价值
C.具有纪念意义
Given the following information about a firm: Net Sales = $1000 Cost of Goods Sold = $ 600 Operating Expenses = $ 200 Interest Expenses = $ 50 Tax Rate = 34% What are the gross and operating profit margins Gross Operating Margin Operating Profit Margin（）①A. 2O% 15% ②B. 4O% 10% ③C. 40% 20%
A. ①
B. ②
C. ③
