Which of the following is least likely to be cited as a limitation of discretionary fiscal policy stabilizers（）

A. Changes in the business cycle are difficult to predict.

B. Taxes paid by households increase as incomes rise.

C. Legal changes are delayed while legislators debate fiscal policy issues.

E-601型蒸发器的器口面积是（）平方厘米。

A.1000

B.2000

C.3000

D.4500