题目内容

有矩阵Ai和Aj,那么它们的乘积等于（）。

Ai+j
B. Ai/j
C. Ai-j
D. Aij

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Whichofthefollowingstatementaboutusingquotationisincorrect?

A. Usinglongquotations,aslongaspossibletoshowyourknowledge.
B. Payingattentiontothecredibilityoftheoneyouquotefrom.
C. Tomakequotesinteresting,introducetheexpertswiththeirbackgroundinformation.
D. Keepingtheexpert'swordsbrief,andreadtheminalivelyandconvincingmanner.

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Ifwewanttousequestionstobeginourspeech,wecanuseyes/noquestions,rhetoricalquestionsandsurvey.

A. 对
B. 错

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Thereisnoneedforustowriteagoodconcludingpart.Wejustsimplyneedtosay“That’sall,thankyou”asaconcludingpart.

A. 对
B. 错

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Becausecommonknowledgearecommon,sotheyarealwaysrightandcanbesupportive.

A. 对
B. 错

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有矩阵Ai和Aj,那么它们的乘积等于（）。

Ai+j B. Ai/j C. Ai-j D. Aij

Whichofthefollowingstatementaboutusingquotationisincorrect?

Ifwewanttousequestionstobeginourspeech,wecanuseyes/noquestions,rhetoricalquestionsandsurvey.

Thereisnoneedforustowriteagoodconcludingpart.Wejustsimplyneedtosay“That’sall,thankyou”asaconcludingpart.

Becausecommonknowledgearecommon,sotheyarealwaysrightandcanbesupportive.

Ai+j
B. Ai/j
C. Ai-j
D. Aij