轴功率为1MW的水泵可配用1MW的电动机。
参考答案:错
As requested _____ your E-mail of October 1, we are sending you _____ the required quotation sheet.
A. in, herewith
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小儿呼吸系统解剖、生理特点是
A.6个月以后,小儿气管及支气管管腔弹力组织丰富,纤毛运动强B.年龄越小,呼吸频率越快C.婴幼儿气道阻力较成年人小D.婴幼儿缺乏sIgE,易反复呼吸道感染E.婴幼儿喉部较短和宽,易发生炎症