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【简答题】
判断下面函数是否是周期信号?若是,求其周期。 1、f1(k) = sin(3πk/4) + cos(0.5πk) 2、f2(t) = cos2t + sinπt
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反馈参考答案：
举一反三
【简答题】我某外贸公司向日本某公司出口一批红枣,双方签订的合同中规定:数量3000公吨,单价FOB上海170美元/公吨。不允许分批装运。对方如期开来信用证,信用证规定总金额为520000美元,数量3000公吨。我外贸公司未要求改证,直接发货3100公吨。 请问:若按发货数量制单,我方能否顺利收汇?并说明理由。
【单选题】We expected that he ____ for the meeting.
A.
turned down
B.
turned on
C.
turned up
D.
picked up
【单选题】It ______ that the jewels had been stolen by a traveler.
A.
turned out
B.
turned up
C.
turned on
D.
turned over
【单选题】How was the dinner in Lady Catherine's home?
A.
It was splendid and delicious.
B.
It was awful.
C.
It was disgusting.
【单选题】What was the relationship between Lady Catherine de Bourgh and Mr. Darcy?
A.
Mother and son.
B.
Aunt and nephew.
C.
Sister and Brother
【单选题】一组星形联接的三相电阻负载接于三相四线制对称电源，已知三个线电流有效值分别为10A、10A和5A，则中线电流有效值为( )。
A.
0A
B.
5A
C.
15A
D.
25A
【单选题】What does Lady Catherine de Bourgh demand of Elizabeth
A.
That she not marry Darcy
B.
That she break up Jane and Bingley
C.
That she marry Mr. Collins
D.
That she pursue a career as a writer
【简答题】That woman turned out to be a thief.
【简答题】Just after this success, however, tragedy 1 . In August of 1973, Stevie was involved in a serious car accident. For nearly a week he lay in a 2 , unable to speak or walk. “We don't know when he’ll be ...
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【单选题】We expected that he ____ for the meeting.
A.
turned down
B.
turned on
C.
turned up
D.
picked up
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