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【单选题】
过冷奥氏体等温冷却转变,温度由高到低,得到的组织分别是()。A.
珠光体、贝氏体、马氏体
B.
马氏体、贝氏体、珠光体
C.
体、奥氏体、渗碳体
D.
奥氏体、体、渗碳体
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皮皮学刷刷变学霸
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【简答题】rare/scarce (1) Human activities, to some degree, may destroy the living environment of wild life, especially _____ animals. (2) Vegetables were ________ last year, for there was a serious flood in th...
【单选题】Which of the following is TRUE?
A.
People evacuated from their homes can return now.
B.
Flood waters arc receding in all parts of the upper mid-western United States.
C.
Flooding is expected to continue for a few more days.
D.
There was a record snowfall last year.
【简答题】档案的特点是什么？
【单选题】(CH 3 ) 2 CHCO 2 Et 通过酯缩合反应可制备 , 所用试剂为 :
A.
C 2 H 5 ONa/EtOH
B.
CH 3 ONa/CH 3 OH
C.
NaOH/H 2 O
D.
Ph 3 CNa
【单选题】ARM920T与ARM9TDMI处理器相比加入了2个协处理器( )。
A.
CP11和CP12
B.
CP12和CP13
C.
CP13和CP14
D.
CP14和CP15
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