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【简答题】
Flying ona plane can cost a lot of money. Now is a good time to buy plane tickets at a low price. Many airlines( 航空公司) are selling 1 tickets. A woman from a news station says that there are good 2 now. But she also says that you 3 be careful. You need to be sure 4 you re-ally want these tickets before buying them. If changes need 5 it will cost a lot of money. You al-so need to 6 your tickets before the middle of December. The 7 will not lose any money 8 selling these cheap tickets. They believe that many people will buy 9 . They will sell 10 tickets now because they cost less money.
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举一反三
【多选题】《计量法》是国家管理计量工作的根本法,共6章35条,其基本内容包括()。
A.
计量立法宗旨、调整范围
B.
计量单位制、计量器具管理
C.
计量监督、授权、认证
D.
家庭自用、教学示范用的计量器具的管理
【简答题】现代足球起源于( )国,古代足球起源于( )。
【简答题】光栅 按用途不同分为 和 , 数控机床中常用 做位置传感器。 光栅位置传感器, 按制造方法 和光学原理 的不同 ,分为 ___________ 和 ___________ 两种。