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【简答题】
某电信公司开设了甲、市内移动通信业务，甲种使用者每月需缴15元月租费，然后每通话1分钟，再付话费0.3元；乙种使用者不缴月租费，每通话1分钟，付话费0.6元，若一个月内通话时间为x分钟，甲、的费用分别为y 1 和y 2 元。 （1）试分别写出y 1 、y 2 与x之间的函数关系式； （2）在同一坐标系中画出y 1 、y 2 的图像； （3）根据一个月通话时间，你认为选用哪种通信业务更优惠？
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举一反三
【多选题】Which of the following statements about a fixed budget is/are correct?
A.
A fixed budget is a budget which is most generally used for planning purposes
B.
A fixed budget is a budget for a single level of activity
C.
A fixed budget is a budget for fixed costs
D.
A fixed budget is a budget which uses the principles of marginal costing
【多选题】Which of the following statements about fixed budget is correct?
A.
A fixed budget is a budget prepared based on the estimated production/sale volume.
B.
A fixed budget is a budget which is most generally used for planning purposes
C.
A fixed budget is a budget for a single level activity.
D.
A fixed budget is a budget for fixed costs
【单选题】Which of the following statements are correct? (i) A fixed budget is a budget that considers all of an organisation’s costs and revenues for a single level of activity. (ii) A flexible budget is a bud...
A.
(i) and (ii) only
B.
(i) and (iii) only
C.
(ii) and (iii) only
D.
All of them
【简答题】骨骼属于 组织，来源于 胚层，神经系统来源于 胚层。
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