体积凝固具有充型能力好,补缩条件优良、热裂纹容易愈合等特点,便于获得致密而健全的铸件;。
参考答案:错
用所给词的适当形式填空。
1. Our class is organizing a talent show________( raise)money for the
charity.
2. I had a good time on my_______( twelve ) birthday party yesterday.
3. Would you like_______(make) a kite for me , dad?
4. Tom wants to join a stamp_______(collect) club.
5.The boy has been_______ ( fly) kites for over four hours.
有a.b.c.d N条直线,依次在a线上写1,在b线上写2,在c线上写3,在d线上写 4,然后在a线上写5,在b线、c线和d线上写数字6,7,8…按这样的周期循环下去,问数字2007在哪条线上( )
A.a线
B.b线
C.c线
D.d线