()
A.
B.
C.
D.
参考答案:C
解析:
原式等同于,观察可知,分子分母各自都是二级等差数列,所以χ=24+11=35,y=27+ 11=38。
This is the house _________ the great man Mao Zedong was born 110 years ago.
A.why
B.that
C.about which
D.in which
数控机床功能部件主要有______、______和______等。