根据我国宪法规定，______级以上的地方各级人民代表大会设立常务委员会。 A．市

机构投资者是否能够进行账户金交易？

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.

透平膨胀机为什么要使用带压力的密封气？应如何操作？

从风机样本上查得风机Y4-73No.20F的某工况点性能参数如下表。指出以下计算哪项错误（）

A.风机的有效功率228kW

B.风机的内效率93%

C.联轴器传动效率98%

D.电机功率实际储备系数1.36