电控燃油喷射发动机最突出的优点是能提供()的燃料.
A.适量空气
B.可燃混合气
C.最佳可燃合气比
D.高压
参考答案:C
根据下列句子中所给的首字母和汉语提示,写出空缺处各单词。
1.—Can you speak J________ —Yes. I am from Tokyo.
2.—Do you have a c________ —Yes. Let's take some photos.
3. We have to s________ playing soccer on the street because it is too dangerous.
4. Why are you playing your CD so I________? I can't sleep.
5. Miss Wang is a teacher. She t________ art in Berlin High School.
6. The people on the beach are really ________ (放松的).
7. Mr. Green has three ________ (孩子).
8. It is cold ________ (外面). Please come in.
9. I can't ________ (记得) what he said to me yesterday.
10. Look! A boy is ________ (哭泣) in the corner.
【问题1】(8分)项目立项前要对项目风险,以及项目的市场前景和相关的社会经济效益进行反复论证,一般来说,项目立项前大致包括哪几个过程,分别起到什么作用?