It is, they say, the right to change employers which distinguishes employment ______slavery.

A． by

B． between

C． from

D． apart

[主观题]C．hange in demand vs．change in quantity demanded 需求变化与需求量的变化

[名词解释] Change in demand vs．change in quantity demanded 需求变化与需求量的变化

[问答题]The friend say everything but did not say single word.

[单选题]A change in the supply of bread is least likely to result from a change in:

[单选题]部门DEPT(Deptno，Name，Tel，Leader)和职工EMP(Empno，Name，Sex，Address， Deptno)实体集，若一个职工只能属于一个部门，部门负责人Leader是一个职工。关系 DEPT和EMP的外码分别为(30)；下图中a、b处的实体名分别为(31)。A．Deptno、EmpnoB．Name、DeptnoC．Leader、DeptnoD．Name、Address

text-aligin:right 是把当前容器里面的内容靠右现实（当前容器最右边）float:right; 是把当前容器相对与父容器靠右对其(父容器最右边)为什么text£­aligin:right与float:right;都有右对齐的功能?

[单选题]__________thecalculationisright,scientistscanneverbesurethattheyhaveincludedallvariablesandmodeledthemaccurately.A．)EvenifB)AsfarasC)IfonlyD)Solongas

[试题]Select emp_id，emp_name，sex，title，wage from employee order by emp_name句子得到的结果集是按()排序。A．emp_idB．emp_nameC．sexD．wage

[单选题]Select emp_id，emp_name，sex，title，wage from employee order by emp_name句子得到的结果集是按（）排序。A . emp_idB . emp_nameC . sexD . wage

[单选题]A．ccording to the survey，______of the employees believed they were praised as much as expected.A．25%B．30%C．40%D．75%