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【多选题】
系统的特征包括( )。A.
集合性
B.
层次性
C.
相关性
D.
统一性
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参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】氯乙烯一乙酸乙烯酯共聚物，按重量计含氯乙烯单体单元为45%；乙酸乙烯酯单体单元为55%（水分散体，初级形状）
【单选题】In the late 1960s many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized: Ecologists pointed out that a cluster of ta...
A.
compare skyscraper's with other modern structures
B.
describe skyscrapers and their effect on the environment
C.
advocate the use of masonry in the construction of skyscrapers
D.
illustrate some architectural designs of skyscrapers
【简答题】It’ s Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They’ re singing and dancing. What are those women doing? They are dri...
【多选题】在土石坝的稳定分析中应该核算的控制土石坝稳定的几个时期包括( )。
A.
施工期(包括竣工时)的上、下游坝坡
B.
稳定渗流期的下游坝坡
C.
水库水位降落期的上游坝坡
D.
水库水位上升期的上游坝坡
【简答题】It' s Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They' re singing and dancing. What are those women doing? They are dri...
【单选题】In the late 1960s many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized: Ecologists pointed out that a cluster of ta...
A.
compare skyscrapers with other modern structures
B.
describe skyscrapers and their effect on the environment
C.
advocate the use of masonry in the construction of skyscrapers
D.
illustrate some architectural designs of skyscrapers
【单选题】so many people in the U.S. been out of work as today.
A.
In the past, there never have
B.
More than ever before have
C.
Never before have
D.
Formerly, there never were
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