单选题
图中表面粗糙度评定参数Ra的含义为（ ）。
轮廓算术平均偏差
轮廓最大高度
取样长度
评定长度
单选题
The purpose of this dialog is to _______.
introduce Melinda to her colleague
receive visitors
introduce the main jobs to Melinda
单选题
Melinda is_______.
the director of the department
the secretary of the department
a new employee of the department
单选题
_______is NOT a responsibility of the department.
Giving presentations
Receiving visitors
Publishing information
单选题
What does Melinda think of her new job?
The work is easy.
The workload is heavy.
She can't handle these jobs at one time.
单选题
What should Melinda do if she has any questions at work?
Work it out by herself.
Ignore the questions.
Seek help from the colleagues in the department.
单选题
地下水按埋藏条件分类可分为（ ）
孔隙水、裂隙水、 岩溶水
裂隙水、包气带水、岩溶水
潜水、孔隙水、包气带水
包气带水、潜水、承压水
单选题
在潜水流向上，相邻两等水位线的高程与水平距离之比称为该距离段内潜水的（ ）
水力梯度
埋藏深度
含水层厚度
潜水水压
单选题
充满于两个隔水层之间的含水层中具有静水压力的地下水是（ ）
孔隙水
潜水
承压水
包气带水
单选题
泉的种类很多，其中由含水层被河流侵蚀切割形成的泉是（ ）
侵蚀泉
接触泉
断层泉
溢出泉