第25题: [单项选择]It was almost 10 years ______ they met again. A) before C) later B) since D) that
A. It was almost 10 years ______ they met again. B. before C. since D. later E. that 参考答案:A
第26题: [单项选择]在经皮椎体成形术中,在哪一阶段将骨水泥注入椎体内() A. 稀薄阶段 B. 黏稠阶段 C. 硬化阶段 D. 凝固阶段 E. 产热阶段 参考答案:B 答案解析:粉液混合50秒后聚甲基丙烯酸中脂开始变黏稠,呈糨糊至生面团状,约持续到3分钟,经皮椎体成形术需在此阶段15~25秒内迅速将聚甲基丙烯酸甲脂注入椎体内,否则,难于将聚甲基丙烯酸甲脂注入椎体内。