昂丹司琼的作用机制是（）
A．阻断H受体
B．阻断M受体
C．阻断质子泵
D．阻断胃泌素受体
E．阻断5-HT3受体
参考答案：E
在高血压性视网膜病变中，当静脉隐匿合并有偏向或移位时，称为________征。
At year-end , Sun company reported cost of goods sold of $ 400 million. Ending accounts payable is $100 million, Assuming there are 365 days in a year, How many days on average it takes Sun company to pay its suppliers.（）
A．80.75 days
B．91.25 days
C．102.25 days
