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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

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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Which of the following mechanical method for making powder is not based on the shearing and collision between the mediums to minimize the particle size of the powders. ()

A. Ball mill
B. Jet mill
C. Vibratory milling
D. Attrition milling

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