0.5L 1mol/L FeCl3溶液与0.2L 1mol/L KCl溶液中的Cl-的数目之比 [ ]
A.5:2
B.3:1
C.15:2
D.1:3
答案:C
John's success has nothing to do with good luck. It is years of hard work _____ has made him what he is today. [ ]
A. why
B. when
C. which
D. that
女,27岁。妊娠7周行人工流产负压吸引术,术者突觉“无底”感,患者随即感下腹部剧烈疼痛,伴恶心,心率75次/分,首先应考虑的诊断是()。
A.失血性休克
B.流产不全
C.羊水栓塞
D.子宫穿孔
E.人工流产综合反应