()指出:“评价过程在本质上是确定课程和教学大纲在实际上实现教育目标的程度的过程”。
A. 斯塔费尔比姆
B. 布鲁姆
C. 格兰朗德
D. 泰勒
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Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?()
A. the direct acting relief valve is used for controlling lower flows and pressure
B. the pilot operated relief valve is used for controlling higher flows and pressure
C. the pilot operated relief valve is used for controlling lower flows and pressure
D. the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
地方政府体制结构的形成是()的产物。
A. 政治
B. 经济
C. 文化
D. 社会发展
电弧的产生是因为()。
A. 触头间产生了大量分子
B. 触头间产生了大量自由电子
C. 触头间产生了大量原子
D. 触头间产生了大量质子
液压系统的辅助元件有()。
A. 滤油器
B. 单向阀
C. O形圈
D. 液压缸
E. 压力表