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【单选题】
数列 的前 n 项和为 ，其中 c 为常数，若该数列 为等比数列，则c的值是A.
B.
C.
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反馈参考答案：
举一反三
【简答题】为什么单片机外扩存储器时，P0口要外接锁存器，而P2口却不接？
【简答题】为什么外扩存储器时,P0口要外接锁存器,而P2口却不接?
【简答题】为什么外扩存储器时，P0口要外接锁存器，而P2口却不接？
【单选题】信用证中采用下列交货术语表示装运时间，《UCP600》规定银行将不予置理_______。( )
A.
Shipment ASAP
B.
Shipment within 30 days after receipt of LC
C.
Shipment during April
D.
Shipment not later than Jan 31
【单选题】信用证中采用下列_ _交货术语表示装运时间,根据くUCP600〉规定,银行将不子置理
A.
shipment during March 2014
B.
shipment as soon as possible
C.
shipment within 35 days, after receipt of L/C
D.
Shipment not later than the end of June 2014
【单选题】信用证中采用( )表示装运时间,《 UCP600 》规定,银行将不予理置。
A.
shipment during April
B.
shipment as soon as possible
C.
shipment within 30 days after receipt of L/C
D.
shipment not later than 31 January
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