The heptane compound has a primary purpose as a plasticizer for doublebase propellant systems.化合物庚烷的主要用途是作为双基推进剂的增塑剂.However, it is difficult to produce multi branched i heptane and restrain its cracking.正庚烷异构化的难点在于高选择性地...
You cannot flay the same ox twice.一头牛不能剥两次皮.They had to flay the great, white, fleecy animals and cut them up for food.他们不得不将这些体形庞大、身披绒毛的白色动物剥皮，然后切碎了做食物。They had to flay the fleecy animals and cut them up for food.他们不得不将...