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【判断题】
( )分度头的分度原理,手柄心轴上的螺杆为主轴上蜗轮齿数为 40,当手柄转过一,分 度头主轴便转动 1/20 。A.
正确
B.
错误
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【简答题】As prices and building costs keep rising, the “do-it-yourself” (DIY) trend (趋势) in the U.S. continues to grow. “We needed furniture(家具) for our living room.” Says John Ross, “and we just didn’t have e...
【单选题】听力原文： Technicians are making the last-minute preparations for the launch of the U. S. space shuttle Discovery on a flight to the International Space Station. Flight officials with the space agency NAS...
A.
vetoed
B.
sanctioned
C.
supported
D.
disapproved
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