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【多选题】
社会阶层的特征有( )。A.
同质性
B.
约束性
C.
多维性
D.
变动性
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举一反三
【单选题】The construction of tens of thousands of monumental engineering projects designed to control floods, protect clean water supplies, and provide water for irrigation and hydropower brought great benefit...
A.
designed
B.
protect
C.
protect and provide
D.
brought
【单选题】The construction of tens of thousands of monumental engineering projects designed to control floods, protect clean water supplies, and provide water for irrigation and hydropower brought great benefit...
A.
designed
B.
protect
C.
protect and provide
D.
brought
【简答题】平面机构中的低副引____入个约束,仅保留___个自由度;高副引入______个约束,保留了____个自由度。
【单选题】What is the correct position for the word also in a second request?
A.
Before the subject
B.
Before the verb
C.
After the verb
【简答题】平面机构中的低副引____入个约束,仅保留___个自由度;高副引入______个约束,保留了____个自由度。
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