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【单选题】
一个负载 经理想变压器接到信号源上,已知信号源的内阻 ,变压器的变比 。若该负载折算到的阻值 正好与 达到阻抗匹配,则可知负载 为 ( )。A.
0.8W
B.
8W
C.
80W
D.
800W
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【简答题】桑代克的尝试错误学习理论发现的学习规律有____、____、____。
【单选题】Which one of the following statements about complying presentation is correct? ( )
A.
When an issuing bank determines that a presentation does not comply, it may, with the agreement from the negotiating bank, approach the applicant for a waiver of the discrepancies.
B.
When an issuing bank determines that a presentation is complying, it may in its sole judgement, decide whether or not to honour.
C.
Banks may refuse to honour or negotiate discrepant documents.
D.
Notice of refusal must be given to presenter no later than close of the tenth banking day following the day of presentation.
【简答题】A written permission．which is granted by the customs authorities when a vessel with exports is able to leave the port，is called（ ）．
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