硬膜外麻醉术中突然出现心率减慢，与哪项相对无关（） ["麻醉平面过高","牵拉反应","全脊髓麻醉","低血压，缺氧","误吸"]
脑缺血性病变的病理分期中，超早期在（） ["24～48小时","2小时内","6～24小时","48～72小时","1～6小时"]
硅酸盐水泥凝结时间在施工中有重要意义，其正确的范围是（）。 ["A、初凝时间≥45min，终凝时间≤600min","B、初凝时间≥45min，终凝时间≤390min","C、初凝时间≥45min，终凝时间≥150min","D、初凝时间≤45min，终凝时间≥150min"]
沿生殖道黏膜上行蔓延传播的是（） ["梅毒","盆腔结核","淋病","滴虫阴道炎","念珠菌阴道炎"]
脊麻平面达T4，平均动脉压下降可达（） ["21%","30%","44%","56%","65%"]
安装与生产同时进行的增加费，应如何理解？
