单项选择题
渣的粘度越大，使用温度越高，耐火材料在渣中的溶解速度越快（ ）
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在分析夹紧力时, 可把螺旋看作是一个缠绕在圆柱体上的斜面, 展开后就相当于________________了。 -
未知题型
The project maintains a current and approved set of requirements over the life of the project by doing the following: .(73)all changes to the requirements . Maintaining the relationships among the requirements, the project plans, and the work products . ……A.MonitoringB.ManagingC.GatheringD.Reducing
A.(73)all
B.Monitoring
B.Managing
C.Gathering
