單項選擇題When comparing the air with 50% of relative humidity with the air with 100% of relative humidity, which one will hold more water?（）
A.the former
B.the latter
C.not for sure
D.same each other
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1.單項選擇題What is the result of converting 10℃ into degree of Fahrenheit?（）
A.0°F
B.18°F
C.32°F
D.50°F
2.單項選擇題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
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