Intelligent use of the muscles means that （）
A. one always knows what his muscles are doing
B. one performs simple actions without working
C. one's muscles are used only to the extent necessary for each action they perform
D. one improves muscular action consciously
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25（）
A. fuels
B. solids
C. soils
D. materials
Muscles are unique fibers, because they can （）
A. contract
B. stretch
C. retract
D. do all of the above
A new mobile phone launched by German technology conglomerate Siemens is______.
A. equipped with a camera
B. linked with a computer
C. introduced with a fashion
D. shown as a new brand
已知(F/A，10%，9)=13.579，(F/A，10%，11)=18.531，10年期，利率为10%的后付年金终值系数值为( )。
A. 17.531
B. 15.937
C. 14.579
D. 12.579
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