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太极拳所蕴含的辩证思维可使人们理性化，对改变人的情绪有积极作用。

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太极拳也是一种教会人如何放松的艺术。

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太极拳的松要求身心都要放松

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Before you use a new raw material for your research or manufacturing products, what should you do for safety considerations.()

A. Prepare a right spot for storage
B. Get and read the material safety data sheets (MSDSs) for safety information's
C. Google or baidu safety information's
D. Ask someone else for safety information's

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We can categorize the furnaces used to fire and sinter ceramic components based on the type of heat source used. Direct electrical heating use Joule principle to produce heat by consuming the electricity. Which materials cannot be used as the heating elements?()

Alumina
B. Zirconia
C. Silicon carbide
D. Molybdenum

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