essential/ɪ'senʃ（ə）l/（）

essential/ɪ'senʃ（ə）l/（）

essential/ɪ'sɛnʃl/（）

essential/ɪ'sɛnʃl/（）

essential/ɪ'sɛnʃl/（）

当方向KR的φsen不能刚好等于被保护线路的φk时，从减小过渡电阻的影响出发，是选择φsenφk好，还是选择φsenφk合适？为什么？

We chose 500 college students and used the Internet to teach them 100 words that often appear in academic 1texts.（）
A.This sen tence gives us the main idea of the "method and procedures" section of the research article.
B.This sentence gives us the main idea of the "introduction" section of the research article.
C.This sentence gives us the main idea of the "conclusion" section of the research article.
D. This sentence gives us the main idea of the "discussion" section of the research article.

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授权经销商销售Service Essential服务产品可享受的折扣是多少（）

Something that is indispensable is:（)

Sometimes, but not often, something （) has been produced unexpectedly by good luck.
A. favorable
B. splendid
C. essential
D. worthwhile

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中英互译：As for me, it is essential to know, at first, what kind of problems young students possble would encounter on campus.

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基础服装系列“ESSENTIAL”今年加入了一些新的元素以下正确的是（）