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【判断题】
光伏阵列的输出电压应处于逆变器MPPT电压范围以内。并且光伏阵列的最大工作电压略大于并网逆变器MPPT电压的中间值，这样可以达到MPPT的最佳效果。A.
正确
B.
错误
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【简答题】字符串运算的命令运行:"ab"+"cd"结果是____ 。
【单选题】The infant industry argument calls for active government involvement _______________.
A.
only if the government forecasts are accurate.
B.
only if some market failure can be identified.
C.
only if the industry is not one already dominated by industrial countries.
D.
only if the industry has a high value added.
【单选题】The infant industry argument is that ___________.
A.
comparative advantage is irrelevant to economic growth.
B.
developing countries have a comparative advantage in agricultural goods.
C.
developing countries have a comparative advantage in manufacturing.
D.
developing countries have a potential comparative advantage in manufacturing.
【简答题】已知滑阀节流口流量方程式为 ，式中，Q为通过节流阀节流口的流量；P为节流阀节流口的前后油压差；x v 为节流阀的位移量；c为流量系数；w为节流口面积梯度；ρ为油密度。试以Q与P为变量(即将Q作为P的函数)将节流阀流量方程线性化。
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