皮皮学，免费搜题
登录
搜题
【单选题】
口腔pH值低时易发生A.
真菌感染
B.
铜绿假单胞菌感染
C.
溃疡
D.
出血
E.
病毒感染
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】关于电压源与电流源的等效变换,下面说法错误的是()
A.
电源等效变换的要求是变换的前后它们具有相同的外特性。
B.
变换前后，它们具有相同的内特性。
C.
任何一个理想电压源和某电阻而串联的电路，都可以等效变为一个理想电流源和一个电阻相并联的电路。
D.
理想电压源和理想电流源之间不能等效变换。
【单选题】Which of the following is NOT true?
A.
The prices of many things have gone up in the last month.
B.
The woman pays twenty dollars for the ticket.
C.
The prices of the ticket have changed by two dollars.
【单选题】Which of the following statements is true?
A.
Most women in England have become doctors and lawyers．
B.
Women are no longer forced to be a supportive role in the society．
C.
The typewriter was invented specially for women．
D.
only“nice ladies”Went out of the home and into the business world．
【单选题】根据我国建设市场发展现状，工程量清单计价和计量规范主要适用于( )。
A.
项目建设前期各阶段工程造价的估量
B.
项目初步设计阶段概算的预测
C.
项目施工图设计阶段预算的预测
D.
项目合同价格的形成和后续合同价格的管理
【单选题】Which of the following statements is INCORRECT?
A.
Computertowns in the UK have become popular.
B.
Computertowns and clubs cater for different people.
C.
Computertowns are more successful than clubs.
D.
It's better that Computertowns and clubs work together.
【单选题】Which of the following is NOT tree?
A.
The prices of many things have gone up in the last month.
B.
The woman pays twenty dollars for the ticket.
C.
The prices of the ticket have changed by two dollars.
【单选题】下面关于实际电压源与实际电流源叙述正确的是( )。
A.
电压源与电流源不能等效变换。
B.
电压源与电流源变换前后对内电路不等效
C.
电压源与电流源变换前后对外电路不等效。
D.
以上三种说法都不正确。
【单选题】关于电源的等效变换，下列说法正确的是（ ）
A.
电压源与电流源不能进行等效变换
B.
电压源与电流源等效变换前后对内电路也等效
C.
电压源与电流源等效变换前后对内电路不等效
D.
变换过程中只需考虑大小关系，方向关系不必考虑
相关题目：