把一杯20毫升的纯牛奶喝掉2毫升,再用水添满,这时牛奶的浓度为 [ ]
A.90%
B.10%
C.95%
答案:A
继发性腹膜炎的腹痛特点是
A.疼痛与进食有关
B.阵发性全腹绞痛
C.逐渐加重的阵发性腹痛
D.高热后全腹痛
E.剧烈、持续性腹痛,原发部位显著
The author of Leaves of Grass, a giant of American letters, is ().
A. Faulkner
B. Dreiser
C. James
D. Whitman