The material is readily prepared by reaction of formaldehyde and hydrazine.这种物质很容易由甲醛和肼反应而得到.Examples of such fuels are monomethyl - hydrazine and diborane.这种燃料的例子是一甲肼和二硼烷.Hydrazine perchlorate and lithium perchlorate fo...
在阳台上她不会遭到猛禽的袭击.She was safe from predatory birds on the verandah.他是一只年轻的鹰, 一只猛禽.He is a young eagle, a bird of prey.有些猛禽从不攻击鸟类, 另外一些也只是偶而为之.Some raptor never attack birds, others only occasionally....