皮皮学,免费搜题
登录
搜题
【单选题】
Which of the following about the industrial age is true?
A.
It is a period in which most people's work has taken the form. of jobs.
B.
Men and women share the productive work of the household and village community.
C.
It makes many people dependent on land.
D.
It ensures economic freedom by making many people dependent on paid work.
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
【单选题】用吸附指示剂法测定NaCl含量时,在化学计量点前AgCl沉淀优先吸附的是
A.
Ag+
B.
Cl-
C.
荧光黄指示剂阴离子
D.
Na+
E.
NO3-
【单选题】下列说法正确的是(  ) ①从匀速传递的产品生产流水线上,质检员每10分钟从某处抽取一件产品进行某项指标检测,这样的抽样是分层抽样 ②某地气象局预报:5月9日本地降水概率为90%,结果这天没下雨,这表明天气预报并不科学 ③吸烟与健康具有相关关系 ④在回归直线方程 y =0.1x+10中,当解释变量 x 每增加一个单位时,预报变量 y 增加0.1个单位.
A.
①②
B.
③④
C.
①③
D.
②④
【简答题】下列说法: ①从匀速传递的产品生产流水线上,质检员第10分钟从中抽取一件产品进行某项指标检测,这样的抽样是分层抽样 ②某地气象局预报:5月9日本地降水概率为90%,结果这天没下雨,这表明天气预报并不科学 ③在回归分析模型中,残差平方和越小,说明模型的拟合效果越好 ④在回归直线方程 中,当解释变量x每增加一个单位时,预报变量平均增加0.1个单位 其中正确的是 (填上你认为正确的序号)
【单选题】Which of the two states are the last two states to join the union?
A.
Alaska and California
B.
Hawaii and Washington
C.
Alaska and Hawaii
D.
Maryland and Texas
【单选题】Our class is made up of 54 students, _____ are girls.
A.
of which two-fifths
B.
of whom two-fifths
C.
two-fifth of which
D.
two-fifth of whom
【多选题】《中国药典》(2015年版)对药物的酸碱度检查,采用的方法有
A.
酸碱滴定法
B.
指示剂法
C.
旋光法
D.
折光法
E.
pH测定法
【单选题】Which movement of the two continents is not mentioned in the article?
A.
Two continents was joined.
B.
One continent is stationary while the other drifting.
C.
Two continents move in reverse direction.
D.
Two continents move in the same direction.
【单选题】用吸附指示剂法测定NaCl含量时,在化学计量点前AgCl沉淀优先吸附哪种离子( )
A.
Ag+
B.
Cl-
C.
荧光黄指示剂阴离子
D.
Na+
E.
H+
【单选题】用吸附指示剂法测定NaCl含量时,在化学计量点前AgCl沉淀优先吸附的是( )
A.
Ag+
B.
Cl-
C.
Na+
D.
NO3-
【单选题】下列说法正确的是:   (     ) ①从匀速传递的产品生产流水线上,质检员每10分钟从某处抽取一件产品进行某项指标检测,这样的抽样是分层抽样②某地气象局预报:5月9日本地降水概率为90%,结果这天没下雨,这表明天气预报并不科学③吸烟与健康具有相关关系④在回归直线方程 中,当解释变量 x 每增加一个单位时,预报变量 增加0.1个单位 (   )
A.
①②
B.
③④
C.
①③
D.
②④
相关题目: