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【多选题】
复合材料性能特点，描述正确的有______A.
比强度和比模量高
B.
良好的抗疲劳和破断安全性能
C.
优良的高温性能和减震性能
D.
具有固定的弹性模量
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【单选题】Do you find getting up in the morning so difficult that it 's painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. Duri...
A.
he is a lazy person
B.
he refuses to follow his own energy cycle
C.
he is not sure when his energy is low
D.
he is at his peak in the afternoon or evening
【单选题】Do you find getting up in the morning so difficult that it's painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. Durin...
A.
he is a lazy person
B.
he is not sure why his energy is low
C.
he refuses to follow his own energy cycle
D.
he is at his peak in the afternoon or evening
【简答题】Do you ever find yourself getting really unhappy for almost no reason? Or suddenly feeling down without knowing why? Going from sadness to anger to joy in a matter of minutes can make many s feel ...
【单选题】Do you find getting up in the morning so difficult that it's painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. Durin...
A.
he is a lazy person
B.
he refuses to follow his own energy cycle
C.
he is not sure when his energy is low
D.
he is at his peak in the afternoon or evening
【单选题】设计键连接的几项主要内容是：a.按轮毂长度选择键的长度 b.按使用要求选择键的适当类型c.按轴的直径选择键的剖面尺寸 d.对键进行必要的强度校核在具体设计时一般顺序为_________。
A.
b →a→c→d
B.
b→c→a→d
C.
a→c→b→d
D.
c→d→b→a
【简答题】字符串"sgabacbadfgbacst" 中存在( )个与字符串"ba"相同的子串。
【单选题】设计键连接的几项主要内容是:a)按轮毂长度选择键的长度;b)按使用要求选择键的类型;c)按轴的直径选择键的剖面尺寸;d)对连接进行必要的强度校核。正确顺序应是 ( ) 。
A.
b-c-a-d
B.
b-a-c-d
C.
a-c-b-d
D.
c-d-b-a
【单选题】设计键 连接 的几项主要内容是 : a) 按轮彀长度选择键的长度 b)按使用要求选择键的主要类型 c)按轴的直径选择键的剖面尺寸 d)对联结进行必要的强度校核。 在具体设计时 ,一 般顺序是 __ 。
A.
b→c→a→d
B.
c→d→b→a
C.
a→c→b→d
D.
b→a→c→d
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