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材料的开口孔孔隙率较大时，材料的表观密度，强度，吸水率，抗渗性，抗冻性，导热性，吸声性。(提示：填写较大或者较小)
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含水率4%的砂100克，其中干砂重克。
称河砂500 g，烘干至恒重时质量为494 g，此河砂的含水率为。
Task 4 Directions:The following is a list of terms related to human resources. After reading it, you are required to find the items equivalent to those given in Chinese in the table below. Then you should mark the corresponding letters in the order of the numbered blanks, 53 through 57, on the Answer Sheet.A---------- Annual leave J ------------- Immediate family memberB---------- Sick leave K--------------Quality managementC---------- Background screening L--------------Risk managementD----------Big data M--------------Team buildingE---------- Child labor N--------------Training needs analysisF-----------Contract of service O---------------Labor marketG---------- Employee assessment P---------------Job classificationH---------- Flexible work arrangements Q---------------Job evaluationI ----------- Job analysisExamples: ( J ) 直系亲属 ( H ) 弹性工作安排
肾单位由下列哪项构成
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