已知函数y=f (x)在点x=x 0 处存在极限,且 lim x→ x 0 + f (x)=a 2 -2, lim x→ x 0 - f (x)=2a+1,则函数y=f (x)在点x=x 0 处的极限是______.
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【简答题】In overhead-valve engines, the camshaft is located in bearings in the cylinder block or crankcase. It is driven from the crankshaft at half the engine speed.According to the paragraph, which statement...
【简答题】In overhead-valve engines, the camshaft is located in bearings in the cylinder block or crankcase. It is driven from the crankshaft at half the engine speed.According to the paragraph, which statement...