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【单选题】
A colour consultant from Toronto explained to the Inter-Society Colour Council meeting in New York an ingenious scheme(巧妙的方案) which a client company had conceived for increasing the sale of potato peelers.He began by pointing out a puzzling fact. ........I................potato peelers 'never wear out',enough are sold in two years in his country to put one in every home.What happens to them?He gave this answer.A.
because
B.
although
C.
for example
D.
since
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反馈参考答案：
举一反三
【单选题】本次变频器实训未做过以下哪个项目?
A.
电动机正反转控制运行
B.
电动机在定时时间内自动输出多段速控制运行
C.
模拟多设备（实际上为灯）散热控制（多段速）
D.
多台电动机联动控制运行
【简答题】采取收集自然排粪法测定鱼体对饲料的消化率会使结果（）。
参考解析：
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