题目:
In order to know those who really need help as well as how to help them, ________ to help others.
A.going
B.to go
C.gone
D.go
答案:
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火箭发射升空时,燃料通过燃烧将化学能转化为燃气的内能;选择液体氢作燃料是因为氢气的热值大;乙图火花塞正在喷出电火花,该冲程是内燃机的做功冲程;在做功冲程中,高温高压的燃气膨胀做功,推动活塞下降,将...