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【简答题】一般来说,( )毫安以下的工频交流电流或( )以下的直流电流,对人体来说可认为是安全电流。
【单选题】Martin Hughes is not your typical hybrid-driving, clean-energy fanatic. Hughes and his wife, both longtime oil-industry veterans, zoom around Houston in no-compromise vehicles. His, a Nissan Xterra SU...
A.
to show he and his wife are both environmentally conscious
B.
m serve as the background of his life story
C.
to introduce the topic of 'green tag'
D.
to encourage the readers m follow suit
【单选题】He is so _____ that he is not only interested in the whats, whys and hows, but also knows where to find the answers to all of these questions.
A.
intelligent
B.
typical
C.
prestigious
D.
average
【简答题】（）是指物品在从生产地到使用地的过程中根据需要进行包装、分割、计量、组装、商品检验等一系列简单作业的总称。
【简答题】工频安全电流是()毫安以下。
【简答题】当孔、轴之间有相对运动要求时,应选( ) 配合。
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