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【单选题】
关于短时自相关函数,下列说法中正确的是( )。A.
计算短时自相关函数时，窗口形状对结果没有影响。
B.
浊音信号的短时自相关函数具有周期性。
C.
清音信号的短时自相关函数具有周期性。
D.
计算短时自相关函数时，窗口长度对结果没有影响。
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皮皮学刷刷变学霸
举一反三
【单选题】Mary often forgets ________ her English book.
A.
bring
B.
brought
C.
is bringing
D.
to bring
【单选题】Mary ______ down the, notes on the board into her book.
A.
copied
B.
wrote
C.
describe
【简答题】'Mary gave a book to Jack' is synonymous with 'Jack______a book from Mary. '(北二外2005研)
【单选题】— What's this in English? — It's _____ English book. _____ book is Mary's. [ ]
A.
a, The
B.
an, A
C.
an, The
【简答题】热水配、回水管、热媒水管常用的保温材料为岩棉、超细玻璃棉、 __ 、 __ 等
【单选题】Mary hit Jack _____ the head _____ a book. [ ]
A.
at; with
B.
on; with
C.
on; by
D.
in; by
【单选题】John is collaborating with Mary in writing a book.
A.
cooperating
B.
merging
C.
combining
D.
associating
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