何所谓采样精密度?
参考答案:
采样精密度是指单次采样测定值与对同一批煤(同一来源,相同性质)进行无数次采样的测定值的平均值的差值(在95%概率下)的极限值。
阅读理解。
This is a book. It's an English book. It is my English book. That is a
dictionary. Is it Lucy's dictionary? No, it isn't. It's Tom's dictionary. Her
dictionary is in her bag. Look! What are these? They're pens. Are they
Tom's pens? No, they aren't. They are Mike's.
1. What's this? It's _______________.
2. What's that? It's _______________.
3. Is it Tom's dictionary? _______________.
4. Where is her dictionary? ______________.
5. Whose pens are those? ________________.
脑干听觉诱发电位主要用于
A.昏迷的鉴别
B.脱髓鞘性疾病的诊断
C.颅后窝肿瘤的诊断
D.药物使用监测
E.以上都对