乙类可燃液体的闪点()
A、<28°
B、≥28°,<60°
C、>28°<60°
D、≥28°,≤60°
参考答案:B
What is the relationship between price and marginal revenue for a price searcher()
A. Marginal revenue > price.
B. Marginal revenue < price.
C. Marginal revenue = price.
H.248协议用于()之间。
A.MG和SR
B.MG和SBC
C.MGC和SR
D.MG和MGC