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【单选题】
Medium speed engines have the following advantages except _______.A.
medium speed engines use less oil than slow speed engines.
B.
Medium speed engines of later type are capable of burning low quality heavy fuel oil.
C.
The engines have long strokes which improve engine efficiency
D.
The engines are compact. Thus providing more spaces for cargoes and passengers.
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【简答题】设f(x)为连续函数，F(t)= ，则F'(2)=______． (A)2f(2) (B)f(2) (C)-f(2) (D)0
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