“ZRN”键是使数控系统处于()状态。
A.自动
B.编辑
C.空运转
D.回零
参考答案:D
He spent _____ money on books and _____ his books are about space and satellite.
[ ]
A. a great deal of; a good many of
B. a good many; a great number of
C. a large quantity of; a large amount of
D. a lots of; plenty of
二十四桥景区为何而建,如今它由哪几部分组成?