Full-automatic chemistry analyzer is the indispensable apparatus for laboratory department in hospital and its revenue climbs almost by 50 percent profit margin of total laboratory.

全自动生化分析仪是医院检验科必备的医疗仪器，在检验科收入和利润中占据近50%的份额。

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In this paper I get the profit be maximum, as the revenue function, cost function are continuous differential and the margin revenue equals margin cost, that marginal profit equals zero.

当收入函数、成本函数为连续可微函数，边际收入等于边际成本，即边际利润等于零时，利润最大；但在离散情况下，上述结论不一定成立，并给出反例。

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But with the increasing of price, total revenue and the level of profit margin will go up.

但总收入随价格上升而增加，利润率水平随价格上升而上升。

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