单项选择题
A.0°F B.18°F C.32°F D.50°F
A process of comparing the actual performance of a mach...
单项选择题A process of comparing the actual performance of a machine with the intended performance, and the adjusting the machine to reduce and eventually eliminate the difference between the actual and intended performance is called（）
A.open loop control B.feedback C.combining control D.integral process
The gauge pressure inside a container is -0~5kg/cm2, th...
单项选择题The gauge pressure inside a container is -0~5kg/cm2, then what is the absolute pressure exerted to the inside surface of thin container?（）
A.0~05Mpa B.0~95Mpa C.1~05Mpa D.0~5Mpa
The crane jib is raised and lowered by means of （）A.a m...
单项选择题The crane jib is raised and lowered by means of （）
A.a mooring winch B.a hoisting winch C.a slewing winch D.a luffing winch
