正态分布的数值变量资料,描述离散趋势的指标最好选用() ["全距","百分位数","方差","标准差","变异系数"]
通过2M传输线进行OMC远程组网所需的设备有() ["路由器","DCM2000","HUB","远程维护终端"]
对子宫收缩有增强作用的麻醉药是() ["羟丁酸钠","硫喷妥钠","丙泊酚","恩氟烷","异氟烷"]
关于胎盘叙述错误的是() ["最终重量相当于胎儿的15%","颜色为粉红色","是母体与胎儿进行物质交换的场所","充当胎儿的肺","形状为扁圆形"]
OMC对设备进行本地维护所需要的设备() ["HUB","DCM2000","路由器","OMC_SERVER"]
简述引起颅内压增高的病因