单项选择题

按承受载荷的不同，轴可分为转轴、传动轴和( )。

A.心轴
B．仲缩轴
C．曲线轴
D．减振轴

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Plan your time carefully. Make a list of your weekly tasks. Then make a schedule or chart of your time. Fill in committed time __21__ as eating , sleeping, meetings, classes, etc. Then decide on good regular times for studying. Be __22__ to set aside enough time to complete your normal reading and work assignments. Of course, studying shouldn't __23__ all of the free time on the schedule. It's important to set aside time for relaxation, hobbies, and entertainment as __24__. This weekly schedule may not solve all of your problems, but it will make you more aware of how you spend your time. __25__, it will enable you to plan your activities so that you have adequate time for both work and play.21)、A.occupyB.suchC.wellD.FurthermoreE.sure22)、A.occupyB.suchC.wellD.FurthermoreE.sure23)、A.occupyB.suchC.wellD.FurthermoreE.sure24)、A.occupyB.suchC.wellD.FurthermoreE.sure25)、A.occupyB.suchC.wellD.FurthermoreE.sure

单项选择题

下列关于绝热过程的表述正确的是( )。

A.热力系统状态变化过程中，工质的压力保持不变
B．热力系统状态变化过程中，工质与外界无任何热量交换
C．热力系统状态变化过程中，工质的温度保持不变
D．热力系统状态变化过程中，工质的比容保持不变

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