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【单选题】
若示波器的触发方式选择为“自动方式”，则在有信号输入时示波器工作在（）A.
连续扫描
B.
触发扫描
C.
断续扫描
D.
交替扫描
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【简答题】设函数f（x）的定义域为R，且对x，y∈R，恒有f（xy）=f（x）+f（y），若f（8）=3，则 f( 2 ) =______．
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【简答题】An inventory system in which the business does not keep a continuous record of the inventory on hand. Instead, at the end of the period, the business makes a physical count of the inventory on hand an...
【简答题】设函数f（x）=ln（-x 2 +x），则f（x）的定义域是______
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【简答题】设偶函数f（x）的定义域为R，当x∈[0，+∞）时f（x）是增函数，则f（-2），f（π），f（-3）的大小关系是______．
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