姚某、叶某和金某经与两家有限责任公司甲公司和乙公司协商，拟共同出资设立一股份有限公司

You may know the song Happy Birthday very well, but do you know about its writer? It___小题1:________(write) by an American girl. And she has become a very rich woman. When she was a child , she was poor. Once she was invited to her friends’ birthday party. She had no money_____小题2:_____( buy) presents for them. She was sad. Her mother said “小题3:__(not worry). How about ___小题4:____(sing) a song together? Happy birthday to…” She decided to write it down and ____小题5:_(sing) it to her friends at the party. They sang and sang “We_____小题6:___(not hear) such a song before.” The party ended up singing a song. Later the girl became well known in America.

对于V2527－A5发动机，哪个说法正确？（）

A.由6个轴承支撑高压和低压2个转子

B.80％的推力是由核心机产生的

C.是由FADEC提供控制的

D.以N1作为推力控制主参数

阅读材料，回答问题。材料：有一个圆，被切去了好大一块，圆想自己恢复完整，没有任何残缺，因此四处寻找失去的部分。因为它残缺不全，只能慢慢滚动，所以能在路上欣赏花草树木，还和毛毛虫聊天，享受阳光。它找到各种不同的碎片，但都不合适，所以都留在路边，继续往前寻找。有一天，这个残缺不全的圆找到一个非常合适的碎片，它很开心地把那碎片拼上了，开始滚动。现在它是完整的圆了，能滚得很快，快得使它注意不到路边的花草树木，也不能和毛毛虫聊天。它终于发现滚动太快使它看到的世界好像完全不同，便停止滚动，把补上的碎片丢在路旁，慢慢滚走了。

问题："缺角的圆"的故事中蕴涵着怎样深刻的内涵，请结合自己的体会谈一谈。

平行投影法中的（）垂直时，称为正投影法。

A、物体与投影面

B、投射线与投影面

C、投影中心与投射线

D、投射线与物体

生物代谢产物包括什么？