单项选择题

梁在集中力偶作用截面处,M图有突变,FS图无变化。(   )

A.对
B.错
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问答题

英翻中: The butter needs to be heated and soften before adding into the mixture. Mix the materials completely with blender in 2 minutes.

答案: 黄油在加入前需要预先加热软化。用(食物)搅拌器充分混合这些材料2分钟。
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