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【单选题】
国家建立( )制度。省、自治区、直辖市人民政府应当划定饮用水水源保护区，并采取措施，防止水源枯竭和水体污染，保证城乡居民饮用水安全。A.
水源保护区
B.
饮用水水源保护区
C.
饮用水保护区
D.
生活水源保护区
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举一反三
【简答题】数控系统一般由()、()、()和()构成。
【单选题】The League Secretary and monitor ______giving a speech while the rest of the class ________ listening attentively.
A.
were, were
B.
was, was
C.
were, was
D.
was, were
【单选题】Just_____to him, and you will see how clever he is!
A.
to listen
B.
listen
C.
listened
D.
listening
【单选题】I think the talk given by the old scientist is ______ worth ______.
A.
very, to listen
B.
well, listening
C.
very, to listen to
D.
well, listening to
【简答题】For more than four hundred years, people all over the world have been reading ,watching and listening to the plays and poetry of the British writer William Shakespeare. Most people think of Shakespear...
【简答题】数控铣床一般由数控系统、主传动系统、( )、冷却润滑系统等几大部分组成。
【简答题】数控系统一般由输入/输出装置、______、伺服系统、机床电气控制装置组成
【简答题】数控系统一般由输入输出装置、( )、( )、( )
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