问答题

磁感应强度又称[填空1]，用字母B表示，表示磁场内某一点的磁场强弱和方向的物理量，是一个矢量。

答案： 1、磁通密度

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多项选择题

Which of the following statements are true of the background of TBA?
A、A task means “any activity that learners engage in to further the process of learning a language ”.
B、Tasks are “communicative exercises that provide opportunities for relatively realistic language use”.
C、Tasks are “always activities where the target language is used by the learner for a communicative purpose in order to achieve an outcome”.
D、Thus, we see more and more emphasis on communication outcomes, and the last definition has won “a broad consensus among researchers and educators”.

单项选择题

（）又称为闭库式盘点法。 A. 期末盘点法 B. 定期盘点法 C. 循环盘点法 D. 临时盘点法