以下有关消化性溃疡并上消化道出血的特点,不正确的是()。
A.定有呕血
B.定有黑便
C.呕血常为咖啡色
D.出血后疼痛减轻
E.出血后可有发热及氮质血症
参考答案:A
— Paper _____ wood. We should not waste paper.
— I agree. I always use _____ sides of paper. [ ]
A. is made of, either
B. is made from, both
C. makes of, both
D. makes from, either
维吾尔Wéi wú ěr