当流量型电控汽油喷嘴（）、（）一定时，喷油量的多少取决于喷油持续时间的长短。
参考答案：喷孔断面；喷油压力
He is not ________to do his homework., which makes his parent worried
A．careful enough
B．enough careful
C．carefully enough
D．enough carefully
有人说：“男女生交往密切，就是早恋。”你赞同吗？为什么？
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