Can is usually unstressed when _________.
A. when another word follows it in a sentence.
B. it is at the end of a sentence.
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/ə/ is the least common vowel sound in English.
A. 对
B. 错
Can't never has a strong pronunciation.
A. 对
B. 错
/i/ is used is many unstressed syllables in words.
A. 对
B. 错
支架的高宽比不宜大于（ ），当高宽比大于该值时，应加强整体稳定性措施，
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