问题
选择题
Bad weather prevented the work ____ in time. [ ]
A. completed
B. from completing
C. to be completed
D. being completed
答案
答案：D
搜题请搜索小程序“爱下问搜题”
Bad weather prevented the work ____ in time. [ ]
A. completed
B. from completing
C. to be completed
D. being completed
答案：D
假定某电信企业在现有网络设施基础上，提供三项业务，分别为Y1、Y2、Y3，为进行成本收益分析，需要估算每一种业务的单位成本。收集到的数据如下：
| 业务种类 | 业务收入(亿元) | 专属成本(亿元) | 公共成本(亿元) |
| Y1 | 6 | 3.8 | 2.4 |
| Y2 | 5 | 1.9 | |
| Y3 | 3 | 0.6 |
根据以上数据资料，为了测算各项业务的单位成本，可以采用的思路有( )。
A．自上而下
B．自下而上
C．从外向内
D．从内向外