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【单选题】
已知液体流动的沿程阻力系数 l 与相对粗糙度和Δ/d雷诺数Re都有关, 即可以判断 该液体流动属于
A.
层流区 r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'> 该液体流动属于 so-symbol-font-family:Symbol'>l 与相对粗糙度 和雷诺数Re都有关，即可以判断 层流区 r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'> 该液体流动属于 so-symbol-font-family:Symbol'>l 与相对粗糙度 和雷诺数Re都有关，即可以判断 层流区 r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'> 该液体流动属于 so-symbol-font-family:Symbol'>l 与相对粗糙度 和雷诺数Re都有关，即可以判断 层流区 r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'> 该液体流动属于 so-symbol-font-family:Symbol'>l 与相对粗糙度 和雷诺数Re都有关，即可以判断 层流区 r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'> 该液体流动属于 so-symbol-font-family:Symbol'>l 与相对粗糙度 和雷诺数Re都有关，即可以判断 层流区
B.
紊流光滑区 dFragment--> r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'> 该液体流动属于 so-symbol-font-family:Symbol'>l 与相对粗糙度 和雷诺数Re都有关，即可以判断 紊流光滑区 dFragment--> r-fareast;mso-fareast-theme-font:major-fareast;mso-hansi-theme-font:major-fareast; mso-bidi-font-family:"Times New Roman";mso-font-kerning:1px;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'>   该液体流动属于 so-symbol-font-family:Symbol'>l与相对粗糙度和雷诺数Re都有关，即可以判断 紊流光滑区
C.
紊流过渡粗糙区
D.
紊流粗糙区
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【单选题】—We get knowledge __________ from books __________ from life.
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either;or
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not only; but also
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【多选题】构成定额的三要素___( )___
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【多选题】构成定额的三要素___( )___
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