30、关于内能做功，以下说法正确的是___ The following statement about Internal Energy doing Work is true___A.荡秋千时，会荡秋千的人到最高点时站直，到最低点时蹲下，秋千会越荡越高； When playing on a Swing, the person who plays on a Swing will stand up straight at the highest point and squat down at the lowest point;#B.荡秋千时，会荡秋千的人到最高点时蹲下，到最低点时站直，秋千会越荡越高； When playing on a Swing, the person who plays on a Swing will crouch down at the highest point and stand up straight at the lowest point. The Swing will go higher and higher;#C.荡秋千时，不会荡秋千的人到最高点时站直，到最低点时蹲下，秋千会逐渐停止； In a Sw
30、关于内能做功，以下说法正确的是___ The following statement about Internal Energy doing Work is true___
A.荡秋千时，会荡秋千的人到最高点时站直，到最低点时蹲下，秋千会越荡越高； When playing on a Swing, the person who plays on a Swing will stand up straight at the highest point and squat down at the lowest point;#B.荡秋千时，会荡秋千的人到最高点时蹲下，到最低点时站直，秋千会越荡越高； When playing on a Swing, the person who plays on a Swing will crouch down at the highest point and stand up straight at the lowest point. The Swing will go higher and higher;#C.荡秋千时，不会荡秋千的人到最高点时站直，到最低点时蹲下，秋千会逐渐停止； In a Sw参考答案和解析
外界对系统做功可增加系统的内能；;外界向系统传递热量可增加系统的内能；;系统的内能是温度和体积的函数。
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They’re doing some very innovative work in solar energy. “innovative” here means something out of date. () 此题为判断题(对，错)。
Before doing any work on a hydraulic system equipped with accumulators, you shouldA.drain the accumulators and purge with oxygenB.bleed off all stored energy from the accumulators completelyC.charge the accumulators to prevent system energy lossD.pump the hydraulic fluid into the accumulators to prevent fluid loss
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密闭有空气的薄塑料瓶因降温而变扁，则关于此过程中瓶内空气(不计分子势能)的说法，正确的是（ ）。A．内能增大，放出热量B．内能减小，吸收热烈C．内能增大，对外界做功D．内能减小，外界对其做功
They’re doing some very innovative work in solar energy.“innovative” here means something out of date.A对B错
They’re doing some very innovative work in solar energy.“innovative” here means something out of date.
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单选题Before doing any work on a hydraulic system equipped with accumulators, you should（）Adrain the accumulators and purge with oxygenBbleed off all stored energy from the accumulators completelyCcharge the accumulators to prevent system energy lossDpump the hydraulic fluid into the accumulators to prevent fluid loss
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