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空气中粉尘分散度的测定方法常用( )。
一个水池安装有3个水管,打开甲、乙两个水管5小时可灌满一池水,打开乙、丙两个水管4小时可灌满一池水。如果单独打开乙管6小时后,再打开甲丙两个水管(此时关闭乙管)1小时,水池里灌满了池水,那么,单独打开乙管灌满一池水要( )小时。
黄酮定量分析可选用()
外墙外保温由功能分为()、保温层、保护层、饰面层四部分组成。
规则类圆形片或斜切片,切面木部有放射状纹理或皮部有多数黄棕色绵状纤维的饮片是()
肾综合征出血热病毒的传染源是()
「ここは静かです。」的否定「ここは静かではありません。」。
结缔组织的化学成分主要取决于胶原纤维和弹性纤维的比例,一般占肌肉组织的7.0%-9.0%。
小鼠编号时不涂色的鼠是几号鼠()
简要说明天线有哪几种分类?
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