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单项选择题

( ) has the earlies record of processing of moxa wool.
A、The Teachings of Bian Que (Biăn Què Xīn Shū, 扁鹊心书)
B、Emergency Formulas to Keep Up One’s Sleeve (Zhŏu Hòu Bèi Jí Fāng, 肘后备急方)
C、Moxibustion Techniques for Gaohuangshu (Jiǔ Gāo Huāng Shū Xué Fǎ, 灸膏肓俞穴法)
D、Collective Commentaries on the Classic of Materia Medica (Bĕn Căo Jīng Jí Zhù, 本草经集注)
E、A Collection of Gems in Acupuncture and Moxibustion (Zhēn Jiŭ Jù Yīng, 针灸聚英)

问答题

对于流化床反应器，当气速增大到某一定值时，流体对粒子的曳力与粒子的（    ）相等，则粒子会被气流带出，这一速度称为带出速度。