一条公路已经修了350千米,剩下的比已修的少150千米,这条公路全长多少千米?
(350-150)+350,
=200+350,
=550(千米),
答:这条公路全长550千米.
CT质量控制中最常用的测试空间分辨率方法是 ()
A.PSF
B.LSF
C.CTF
D.MTF
E.ERF
One Friday, we were packing to leave for a weekend away _______ my daughter heard cries for help.
A.after
B.while
C.as
D.when