磨削指示仪利用砂轮电动机功率变化,感应砂轮与工件表面接触压力,用试磨法可求得φ表的每格当量。(量具知识)
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在规定的时间内完成规定功能的能力称为()。
A. 计量性能
B. 防护性能
C. 可靠性能
静压轴承若在静压系统中不设节流器,则压力差就建立不起来。
A. 正确
B. 错误
Automatic data conversion will occur if which of the following happens?()
A. The client and server have different NLS_LANGUAGE settings
B. The client and server character sets are not the same,and the database character set is not a strict superset of the client character set
C. The client and server are in different time zones
D. The client requests automatic data conversion
E. The AUTO_CONVERT initialization parameter is set to TRUE
地形图可以进行修测,但修测的面积如果超过原图总面积(),应重新进行测绘。
A. 1/5
B. 1/3
C. 1/2
D. 1/4