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【多选题】
下列材料属于脆性材料的有( )A.
混凝土
B.
黏土砖
C.
低碳钢
D.
木材
E.
陶瓷
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反馈参考答案：
举一反三
【简答题】根据氨基酸分子中所含氨基和羧基数目的不同，将氨基酸分为中性氨基酸、酸性氨基酸和_____这三类。
【单选题】下列集合中表示空集的是( )
A.
{ x ∈ R | x + 5 = 5}
B.
{ x ∈ R | x + 5>5}
C.
{ x ∈ R | x 2 = 0}
D.
{ x ∈ R | x 2 + x + 1 = 0}
【单选题】下列集合中表示空集的是 ( )
A.
{ x ∈ R | x ＋ 5 ＝ 5}
B.
{ x ∈ R | x ＋ 5>5}
C.
{ x ∈ R | x 2 ＝ 0}
D.
{ x ∈ R | x 2 ＋ x ＋ 1 ＝ 0}
【单选题】听力原文：M: Dialogue has so many possible applications. It can be useful in problem solving, conflict resolution and more. Linda, (23) could you give us an idea of what dialogue is? W: (23) Let's look fir...
A.
The man is not determined.
B.
The man is poorly experienced in the aquatic field.
C.
The man is not honest.
D.
The man was late for the interview.
【简答题】Which of the following is true about registered Turk users? [A] They get rewards by solving postedproblems. [B] They set up a separate account ascompanies do. [C] They pay out fees to other users fort...
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