患者，男，47岁，突然神志丧失，呼吸不规则，即刻进行心脏按压，判断其是否有效的主要方法是

A．测血压

B．呼喊患者看其是否清醒

C．摸桡动脉搏动

D．摸股动脉搏动

E．观察末梢循环状况

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