450-450÷25×18.
450-450÷25×18,
=450-450×1825,
=450×(1-1825),
=450×725,
=126.
The secretary________letters all the afternoon and there are still two letters to finish.[ ]
A. is typing
B. had type
C. has been typed
D. has been typing
政策科学的功能可以归结为()。
A.贯穿领导意志
B.促进科学地制定政策
C.减少政策的失误率
D.提高政策的有效性