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【多选题】
通过渗碳及后续热处理,可以使齿轮表面具有( )和( )和( ),而心部仍保持低碳钢的韧性和塑性,能承受冲击载荷。
A.
高硬度
B.
高的耐磨性
C.
好的腐蚀性能
D.
高疲劳强度
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举一反三
【单选题】下列哪项不是紫癜风热伤络型症状?( )
A.
紫癜反复发作
B.
颜色较鲜明
C.
关节肿痛,尿血
D.
小腿及臀部较多
E.
腹痛剧烈
【单选题】My wife complaints that the television serial play is often interrupted by _______.
A.
literature
B.
commercials
C.
media
D.
correspondence
【多选题】当变量值呈钟型分布时,算术平均数( )、中位数()和众数( )的关系是( )
A.
对称的钟型分布中:
B.
左偏的钟型分布中:
C.
左偏的钟型分布中:
D.
右偏的钟型分布中:
E.
右偏的钟型分布中:
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A.
1
B.
2
C.
3
【单选题】我国目前实施的是(    )检验检疫货物通关制度。
A.
先报关,后报检    
B.
先报检,后报关
C.
报检报关同日完成    
D.
先报关,抽查报检
【单选题】My wife's ______ complaints about the bathroom being too small really gives me a big headache but I can't do anything but _____ to accept it as it is. [     ]
A.
often; have
B.
constant; to have
C.
usual; have
D.
frequent; have
【简答题】什么是软件危机?它的表现有哪些?如何消除软件危机?
【单选题】The writer thinks that academic work has recently become more specialized because ______.
A.
more people are studying sciences
B.
a greater variety of subjects are studied
C.
more students are doing postgraduate work
D.
the number of universities has increased
【简答题】什么叫做软件危机?软件危机的典型表现有哪些?
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