复合硅酸盐水泥中混合材料总掺加量按质量百分比计为()。
A.15%~50%
B.20%~50%
C.15%~40%
参考答案:A
Money can not take ______place of our happiness, which is _______common sense for many of us.
A.the ; a
B.不填; a
C.the ; the
D.不填; the
患者,男,27岁。4年来右上腹部节律性疼痛,进食可缓解,伴有反酸,3天前突然疼痛加重,伴有黑便,每日2~4次。此病例考虑的诊断是()
A.食管静脉曲张破裂出血
B.急性胃炎出血
C.反流性食管炎出血
D.食管贲门黏膜撕裂综合征
E.消化性溃疡出血