女性，32岁。阵发性头痛、心悸伴大汗1个月来诊。入院时体检：血压180／120mmH

This information allows businessmen to keep________ of their list of goods by showing which items

are being sold and how fast they are moving.[      ]

A. sight  

B. track

C. touch  

D. sign

下列订货成本中属于变动性成本的是（）。

A．采购部门管理费用

B．采购人员的固定工资

C．订货业务费

D．预付订金的机会成本

A portfolio has a return of 14.2 percent and a Sharpe's measure of 3.52. If the risk - free rate is 4.7 percent, what is the standard deviation of returns（）

A. 2.6%.

B.3.9%.

C.2.7%.

舌尖中送气清塞音是（）。