使用量缸表测量时，必须使量杆与汽缸的轴线保持垂直。
正确
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________,thefirstsettlersfoundinNewZealandmanystrangebirdsandanimalsthatexistnowhereelseintheworld.
Americaisan__________country.Youcanhear__________everywhere.
Theshop_________until7o’clock.
Thespeechisstronglyimpressed________mymemory.
设A矩阵，B矩阵则AB=___
