Everyone likes to buy things ______ a good price.[ ]
A. in
B. on
C. for
D. at
答案:D
在“此则天地显仁藏用之常,固无庸以赞助为也”中,“为”之义是()
A.做
B.给
C.成
D.语助词,无义
慢性呼吸衰竭缺氧明显伴二氧化碳潴留时,采用氧疗的给氧浓度,下列哪项是正确的? ()
A.小于25%
B.小于35%
C.小于45%
D.小于55%