制粉系统漏风对运行经济性影响很大，对安全性也不利。
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使用兆欧表测量绝缘电阻时，转速为（）时，测量值比较准。
A. 600r/min
B. 400r/min
C. 120r/min
D. 100r/mi
（）和（）为英国皇室特权立法，是香港回归前的宪法性文件，香港回归后，被（）所取代。
接发列车人员、调车人员、巡道工、防护员、道口工等工作人员，严禁在什么地方显示信号？
During an AIX installation, which of the following actions will occur once the Complete Overwrite option is selected?（）
All new disks in the system will be formatted
B. Only the contents of the root volume group destination disks will be destroyed
C. All file systems, including /(root), /tmp, /usr, and /var, but no usr data in the root volume group, will be destroyed
D. The contents of all disks on the system, even if they are not shown as the destination root volume group disks, will be destroyed
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