皮皮学，免费搜题
登录
搜题
【简答题】
测定某一热交换器水垢中的 Fe 2 O 3 百分含量,进行了 7 次平行测定,经校正系统误差后,其百分含量为 79.58 , 79.45 , 79.47 , 79.50 , 79.62 , 79.38 和 79.80 。用 Q 检验法检验置信度为 99% 时, 79.80 是否舍弃?并求平均值、标准偏差和置信度为 99% 时的置信区间。已知: n=7 时, Q 0.99 =0.68 , t 0.99 =3.71 ; n=6 时, Q 0.99 =0.74 , t 0.99 =4.03
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】In the computer age, most of us take a broadband（宽带）Internet connection for granted. Whether cable or mobile broadband, today’s connections are many times faster than those in the early days. Videos p...
【单选题】Broadband(宽带) connections are widely available now, ________ makes online shopping
A.
what
B.
whatever
C.
who
D.
which
【单选题】Broadband(宽带) connections are widely available now, ________ makes online shopping
A.
ch easier.
B.
what
C.
whatever
D.
who
E.
which
【单选题】Broadband ( 宽带 ) connections are widely available now, ________ makes online shopping much easier.
A.
what
B.
whatever
C.
who
D.
which
【单选题】一新生儿,女,日龄3天。洗澡时母亲发现其两侧乳腺均有蚕豆大小肿块,轻挤有乳白色液体流出。正确的处理方法是
A.
用手挤压
B.
挑割肿块
C.
手术切除
D.
使用抗生素
E.
无需处理
【简答题】用动词的适当时态填空: Lucy and Lily _____(be) twins.
【简答题】broadband cable 宽带电缆
相关题目：