北航《新型建筑材料》在线作业一（BUAA new building materials online homework）.docVIP

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北航《新型建筑材料》在线作业一（BUAA new building materials online homework）.doc

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北航《新型建筑材料》在线作业一（BUAA new building materials online homework）.doc

北航《新型建筑材料》在线作业一（BUAA new building materials online homework） BUAA new building materials online homework Total score: 100 test time: - Radio examination A multiple-choice question Judgment question Radio examination questions (10 questions, 40 points) 1. mixing concrete with the same mark cement, the strength of concrete mainly depends on (). A. sand rate B. water consumption C. water cement ratio D. stone strength Full marks: 4 2. in the following steels, the best plasticity and weldability are (). A. Q215 B. Q255 C. Q275 D. Q235 Full marks: 4 3. slag cement and volcanic ash cement, the two () different. A. frost resistance B. hydration heat C. heat resistance D. intensity development Full marks: 4 4. when the free water evaporates and the adsorbed water is still saturated, the moisture content of wood is called wood. A. equilibrium moisture content B. standard moisture content C. fiber saturation point D. air dry water content Full marks: 4 5. wet sand 100g with water content of 5%, in which the weight of water is () A. 5g B. 4.76 C. 5.26 D. 4 Full marks: 4 6. prestressed hollow wallboard belongs to (). A. gypsum wallboard B. cement wall C. composite wallboard D. net plastic sandwich panel Full marks: 4 7. the ageing of lime in order to (). A. is good for crystallization B. evaporates excess moisture C. eliminates the danger of excessive lime D. reduces calories Full marks: 4 The strength grade of 8. fired common bricks is based on (). A. compressive strength and flexural strength B. big face and strip surface compressive strength C. compressive strength average and single block minimum D. compressive strength average value and strength standard value Full marks: 4 9. when choosing the structural material under dynamic load, the following materials should be chosen. A. materials with good plasticity B. materials with good toughness C. material with good elasticity D. materials of good hardness Full marks: 4 10. modulus of elasticity reflects the quality of steel.