For a linear demand curve, at the price where elasticity is -2.0, reducing prices will: （）

A. increase total revenue and we are at the point of maximum total revenue.

B. decrease total revenue and we are not at the point of maximum total revenue.

C. increase total revenue and we are not at the point of maximum total revenue.

充油套管诊断性试验，油中溶解气体分析，氢气应满足（）。

A.≤500（μL/L）

B.≤300（μL/L）

C.≤150（μL/L）

D.≤100（μL/L）