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【单选题】
闭式导轨中接触面最少的一种结构的导轨组合是( )A.
双三角形导轨
B.
双矩形导轨
C.
燕尾形导轨
D.
三角形和矩形导轨的组合
E.
矩形和燕尾形导轨的组合
F.
双圆柱导轨
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反馈参考答案：
举一反三
【简答题】关于女性内生殖器,下述哪项不对
【简答题】The dog plays outside. The dog is friendly.
【判断题】The IUPAC name of an alkene is derived from the name of the longest chain of carbon atoms that contains the double bond.
A.
正确
B.
错误
【单选题】铝、镁及其合金采用直流钨极氩弧焊时,不应该将钨极接在电源的正极上,其原因是()。
A.
避免钨极损耗过大
B.
容易产生气孔
C.
工件表面没有“阴极破碎”作用
D.
飞溅大
【单选题】Why does the text imply that there are so many neighborhoods with houses that look similar?
A.
Buyers prefer them.
B.
They are cheaper to produce.
C.
A slow real estate market.
D.
Local building codes.
【单选题】关于女性内生殖器,下述哪项不对
A.
输卵管长8~14cm
B.
子宫壁分为三层
C.
子宮腔冠状断面呈倒置三角形
D.
阴道黏膜有许多纵行皱襞
E.
输卵管分为四个部分
【简答题】Give an IUPAC substitutive name for each of the following alcohols:
【单选题】The best time for a training session to begin is when the dog is somewhat hungry because the trainer can use food to tempt the dog to follow his command.
A.
Y
B.
N
C.
NG
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