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问题
名词解释
自吸泵
答案
参考答案:
液压泵的吸油腔容积能自动增大的泵。
选择题
— How many girls are there in our class?
— In our class
of the students are girls.
A. three fifths
B. three fifth
C. third five
D. third fifths
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单项选择题
切削速度在()区间时容易形成积屑瘤。
A、极低速
B、低速
C、中速
D、高速
查看答案