Which of the following statements is least accurate According to the quantity theory of money:（）

A. velocity is determined by institutional factors.

B. inflation is a function of increases in the money supply.

C. the price level is equal to the quantity of output divided by the money supply.

进入SF6配电装置低位区或电缆沟进行工作，应先检测（）和（）含量是否合格。