Robert Necco and Nelson Packard are economists at Economic Research Associates. ERA asks Necco and Packard for their opinions about the effects of fiscal policy on real GDP for an economy currently experiencing a recession. Necco states that real GDP is likely to increase if both government spending and taxes are increased by the same amount. Packard states that if both government spending and taxes are increased by the same amount, there is no expected net effect on real GDP. Regarding the statements made by Necco and Packard: Necco Packard（）①A. Correct Correct ②B. Correct Incorrect ③C. Incorrect Incorrect

A. ①

B. ②

C. ③

按照《全国互联电网调度管理规程》规定，凡新建、扩建和改建的发、输、变电设备需接入国调管辖系统，该工程的业主必须在新设备启动前（）向国调提供相关资料，并于15天前提出投运申请。

A.交流系统3个月

B.交流系统4个月

C.直流系统4个月

D.直流系统5个月