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【单选题】
箱壳类零件主要起包容、支承其他零件的作用,常有内腔、轴承、凸台、肋、( )、螺纹等结构A.
中心、键槽
B.
皮带轮、轮辐
C.
安装板、光
D.
斜支架、拨叉
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【简答题】根据首字母和汉语提示完成单词。 1. When you are in public, you m______ talk too loudly? 2. People usually shake h______ with others when they meet for the first time? 3. It's ______ (礼貌的) to wait for everyone to pu...
【简答题】根据下列材料，请回答 48～50 题： 第 48 题
【简答题】Gloves have been used since earliest times. Cave people wore bag-like gloves ofanimal skins to protect their hands. Farmers, hunters ,and soldiers of long agoused them for their work. Kings and queens...
【简答题】根据下列材料，请回答 48～51 题： 第 48 题
【简答题】Read the following passage and answer the questions When the H1N1 virus broke out in the US in 2009, No one called it “America Virus”. When this novel coronavirus broke out in China, you call it China...
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