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【单选题】
采用( )制造塑料模具时,可在固溶处理后进行切削成形加工,然后通过时效处理,使模具获得较高的强度和硬度,并有效保证模具的最终尺寸和形状精度。A.
渗碳型塑料模具钢
B.
整体淬硬型塑料模具钢
C.
时效硬化型塑料模具钢
D.
预硬型塑料模具钢
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【简答题】根据图片,在括号内写出叶变态类型。
【简答题】The boy ___ is wearing a black coat bought an iPod yesterday. David is a kind person ___always helps others. Football is a ____is liked by most boys. The film , ____ they went to see last night , ...
【单选题】若用永停滴定法确定某滴定类型的化学计量点,计量点前检流计指针偏转,计量点后检流计指针不发生偏转,属于此滴定类型的是
A.
Na2S2O3滴定I2
B.
I2滴定Na2S2O3
C.
HCl滴定NaOH
D.
AgNO3滴定NaCl
E.
Ce(SO4)2滴定FeSO4
【单选题】听力原文：M: This is a stylish overcoat I saw you wearing it last week, didn't I? W: Oh, that wasn't me. That was my sister Jill. She's in your class. Q: What does the woman mean? (18)
A.
Her overcoat is as stylish as Jill's.
B.
Jill missed her class last week.
C.
Jill wore the overcoat last week.
D.
She is in the same class as the man.
【简答题】LC并联谐振电路接在理想电压源上是否具有选频性？为什么？
【简答题】阅读理解。 I am wearing a small red ribbon this morning to remind myself and others around me that today is World Day. The red ribbon, an international symbol of awareness, is gaining increasing ...
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