单项选择题

电子商务的产生缩短了商品的循环周期，节约了用于产品设计的时间。（）

A.正确
B.错误

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在使用手电钻、电砂轮等手持电动工具时，必须安装漏电保护器。（）

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Steamboat Willie was 'Mickey's screen debut'( Line 1, ParA.), which means that ______.A.it was the first time that Mickey appeared in filmsB.this cartoon was a big successC.it was the last time that Mickey appeared in filmsD.Mickey was the leading role in this film

A.A.it
B.this
C.it
D.Mickey

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