题目内容

简述内部声像资料的特点、内容及制作程序。

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On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will ().

A. set the vessel to the left
B. set the vessel to the right
C. offer resistance in the form of a head current
D. furnish additional thrust in the form of a fair or following current

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