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【多选题】
热力作用下引起的对流,其特点是_______。A.
水平范围小
B.
持续时间垂直速度小
C.
垂直速度小
D.
水平范围大;
E.
持续时间长
F.
垂直速度大
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皮皮学刷刷变学霸
举一反三
【简答题】我国现行的标准钢轨类型不包括( )kg/m。 A、75 B、50 C、45 D、60
【单选题】听力原文：M: What are you doing? W: I'm ordering some filing cabinets out of a catalog. M: What do you need them for? W: There's so much stuff piling up in my dormitory room. If I don't do something soon, ...
A.
The necessity to keep everything in place.
B.
Catalogs used as textbooks by country school teachers.
C.
Sears and Ward and catalog sale business.
D.
The competition between small stores and catalog sale.