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【多选题】
脂肪的营养功能可概括为（）A.
脂肪是动物热能来源的重要原料
B.
脂肪是构成动物体组织的重要原料
C.
是脂溶性维生素的溶剂
D.
可为幼小动物提供必需脂肪酸
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举一反三
【单选题】Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net. 【B1】______ they hope for a good catch of fish. But to their 【B2】______ ...
A.
As a result
B.
As it is
C.
As expected
D.
As usual
【简答题】高速走丝电火花线切割机床的的数控系统大多采用()A. 步进电动机开环系统 B. 步进电动机闭环系统 C. 伺服电动机半闭环系统 D. 伺服电动机全闭环系统
【单选题】Most of the dead villagers were children because
A.
it was early morning of the school day
B.
the others except schoolchildren could leave the village
C.
children were asked to keep there for the sake of security
D.
children escaped more slowly than the others
【简答题】目前高速走丝电火花线切割机床的数控系统大多采用较简单的步进电动机开环系统，而低速走丝电火花线切割机床的数控系统则大多采用伺服电动机加码盘的（），仅在一些少量的超精密线切割机床上采用了伺服电动机加磁尺或光栅的（）。
【简答题】The early morning fire damaged the historic Gallad House today. It destroyed the third floor of the building so fire fighters saved the first and the second floors. There were only a few elderly peopl...
【单选题】Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.【1】they hope for a good catch of fish. But to their【2】, a horrible sight...
A.
As a result
B.
As it is
C.
As expected
D.
As usual
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