Why are removable sleeves installed on centrifugal pump shafts?()
A. They make it easier to replace the pump shaft packing
B. They can be economically replaced as they wear out
C. They can be removed when it is necessary to lighten the weight of the pump
D. They increase the strength of the shaft
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通风与空调工程按《建筑工程施工质量验收统一标准》GB50300--2013划分为送风系统、排风系统、防排烟系统、除尘系统、舒适性空调系统等()个子分部工程。
A. 7
B. 14
C. 20
D. 22
综合实践活动是()。
A. 选修课程
B. 地方课程
C. 校本课程
D. 必修课程
战略实施是战略管理的核心环节。
A. 正确
B. 错误
出现移印不良现象的原因包括()等.
A. 内容错误、颜色错误、移印位置错误
B. 内容错误、颜色错误、移印脱落、移印位置错
C. 内容错误、颜色错误、移印脱落、图纸错误
D. 内容错误、颜色错误、移印偏、移印位置错误