___________, we would be in a difficult situation. A: If it wasn't for their support B: If it weren't for their support C: If it isn't for their support D: If it aren't for their support

面心立方、体心立方和密排六方的空间利用率分别为__________________。 A: 74%、74%、74% B: 68%、68%、68% C: 74%、68%、74% D: 68%、74%、68%

面心立方、体心立方和密排六方的配位数分别为 A: 74％、68％、74％ B: 68％、68%、68% C: 68％、74%、68% D: 74％、74%、74%

面心立方、体心立方和密排六方的致密度分别为()。 A: 68%、68%、68% B: 74%、68%、74% C: 68%、74%、68% D: 74%、74%、74%

Empirical observations on actual North-South trade patterns tend to? support the validity of the Leontief Paradox.|support the validity of the neo-imperialism exploitation theory.|support the validity of the Heckscher-Ohlin model.|support the validity of the wage equalization theorem.

Each piece of support should be clearly relevant to the point it is used to support（ ）

体心立方（A2或BCC）、面心立方（A1或FCC）、密排六方（A3或HCP）晶体结构的致密度分别为（ ）。 A: 68%，74%，74% B: 74%，68%，68% C: 68%，68%，74% D: 74%，74%，68%

68×5大约得（），因为68接近（），所以（）×5=（）

68

中国大学MOOC: To support evidence and exemplification from sources to support an argument is literature review.