样品处理系统使用液封的目的是()。
A、保持分析仪样品压力稳定
B、过滤样品中的杂质
C、增加样品湿度
D、作为样品旁路
参考答案:A
_____ the people present, I _____ without a word. [ ]
A. If it were not; go
B. Were it not for; would go
C. weren't it for; would go
D. If it hadn't been; would have gone
患者,女,30岁,已婚。2月前曾行人流术,术后觉下腹隐痛,伴腰骶酸痛,活动后明显。月经22~25天一行,带下无异常。其诊断是()
A.痛经
B.带下病
C.月经先期
D.盆腔炎
E.以上均非