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问题 选择题

My aunt has a clothes store. She ______jackets at very good prices.   [ ]

A. takes        

B. buy        

C. affords      

D. sells

答案

答案：D

单项选择题

A project management technique that is currently in widespread use is the （） . The purpose of this technique is to detail, in hierarchical fashion, all of the activities that are required to meet project objectives. There are some special activities called （） , which are events that signify the accomplishment or completion of major deliverables during the project. Most system development methodologies also provide （） , whose purpose is to contain the various pieces of relevant information – feasibility assessments, schedules, needs analysis, and so forth – in a single place so that they can be presented to project clients and other related parties. Several types of important network diagrams are used in project management. （）was developed to make clear the interdependence between project tasks before those tasks are scheduled. （） offers the advantage of clearly showing overlapping tasks.

（）offers the advantage of clearly showing overlapping tasks.

A．CPM

B．Network Diagram

C．PERT

D．Gantt chart
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单项选择题

两相溶剂萃取法分离混合物中各组分的原理是

A．各组分的结构类型不同

B．各组分的分配系数不同

C．各组分的化学性质不同

D．两相溶剂的极性相差大

E．以上都不对
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