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【单选题】
某系统对斜坡输入的稳态误差为零 , 则该系统是 ( )A.
0 型系统
B.
Ⅰ型系统
C.
Ⅱ型系统
D.
无法确定
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举一反三
【单选题】There has been increasing interest in the Nazac lines mainly because of ______.
A.
the participation of scientists.
B.
the emergence of the internet.
C.
the birth of new theories.
D.
the interest in the Internet.
【单选题】A search engine reads its () of sites and site information around the world for particular items searched on by users.
A.
webpage
B.
database
C.
attachment
D.
password
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