皮皮学，免费搜题
登录
搜题
【多选题】
预测分析包括()。A.
销售预测
B.
成本预测
C.
资金需要量预测
D.
利润预测
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】2, As is known to all, China remains a developing country in many ways in spite of her rapid economic development.
【单选题】_______all her efforts, she failed the College Entrance Examination. [ ]
A.
In spite of
B.
In order to
C.
Regardless of
D.
On account of
【简答题】What does “ she had a job to do ” (Para. 1) mean according to the context? (1.0分)A. She had a regular job in the store. B. She wanted to ask for help. C. She wanted to buy a DVD. D. She was thinking o...
【单选题】欲以 K 2 Cr 2 O 7 法测定铁矿石中的全铁含量时,把铁还原成 Fe 2+ ,应选用的还原剂是( )
A.
Na 2 WO 4
B.
SnCl 2
C.
KI
D.
Na 2 S
【多选题】利用K2Cr2O7法测定铁矿石中全铁的含量时,加入H3PO4的主要目的是 ( )。
A.
提供酸性环境
B.
降低Fe3+/Fe2+电对电位，使指示剂变色点落入突跃范围内
C.
生成无色的Fe(HPO4)2-，消除Fe3+黄色对终点的干扰
D.
选项都不对
【单选题】What does a navigator who uses an ECDIS require? ____
A.
Good navigational knowledge and a professional job attitude
B.
Good computer knowledge
C.
Good system knowledge
D.
Nothing special
【多选题】K 2 Cr 2 O 7 法测定铁矿石中铁含量时,加入 H 2 SO 4 -H 3 PO 4 混酸的作用是
A.
增加溶液酸度
B.
增大滴定突跃范围
C.
消除 Fe 3+ 黄色对终点观察的影响
D.
降低 Fe 3+ \ Fe 2+ 电对的电位
相关题目：
参考解析：
知识点：
题目纠错 0
发布
