在测量中,如果兆欧表的指针指到()位置,表明被测电气设备的绝缘一定不正常。
A. “0”
B. “∞”
C. 中间
D. 接近于“∞&rdquo
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When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?()
A. The diesel oil must never be allowed to mix with the heavy fuel
B. The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C. The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D. The heating steam must be secured before the diesel oil passes through the three-way valve
Day-shapes must be displayed().
A. Between sunset and sunrise
B. Only between 8 AM and 4 PM
C. During daylight hours in any visibility
During daylight hours in unrestricted visibility only
以下选项不是奥运会女子静水皮划艇项目的是()
A. 200米单人皮艇
B. 500米单人皮艇
C. 500米四人皮艇
D. 200米四人皮艇