皮皮学，免费搜题
登录
搜题
【多选题】
有一碱液,可能是 NaOH 、 NaHCO 3 、 Na 2 CO 3 中的一种或两种,现用“双指示剂法”测量,用酚酞作指示剂是消耗 HCl 体积是 V1 ,再用甲基橙作指示剂是消耗 HCl 体积是 V2 ,则下列 V1 和 V2 的关系可能有的是( )A.
V1 ＜ V2
B.
V1 ＞ 0 ， V2=0
C.
V1=0 ， V2 ＞ 0
D.
V1 ＞ V2
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】The second factor is the so-called “bamboo ceiling,” a theory that posits that Chinese graduates can expect to be employed in tech companies abroad, but are rarely promoted as far as upper management.
【单选题】The ________ posits that the goal of learning a foreign language is to develop an ability to read its literature, for which purpose grammar study and translation activities between the native and for...
A.
the Direct Method
B.
the Grammar-Translation Method
C.
the Audioligual Method
D.
the Humanistic Approach
【单选题】下列( )是合法的电子邮箱地址。
A.
zhangsan@sina.com
B.
zhangsan#sina.com
C.
zhangsan@sina
D.
http://zhangsan@sina.com
【单选题】The _____ posits that trade flows between countries will be larger as the economic sizes of the two countries are larger and the geographic distance between the two countries is smaller.
A.
Heckscher-Ohlin model
B.
theory of absolute advantage
C.
gravity model
D.
Stolper-Samuelson theorem
【判断题】The expectancy-value model of attitude formation posits that consumers evaluate products and services by combining their brand beliefs according to importance.
A.
正确
B.
错误
相关题目：