兰大《土木工程材料》13春在线作业4（Lan Da, civil engineering materials 13 spring online homework 4）.doc

兰大《土木工程材料》13春在线作业4（Lan Da, civil engineering materials 13 spring online homework 4） 14 spring 13 autumn big blue civil engineering materials 13 spring online homework 4 Total score: 100 test time: - Radio examination A multiple-choice question Judgment question Radio examination questions (10 questions, 40 points) 1. steel after cold hardening A. plastic improvement B. toughness improved C. yield strength increased D. tensile strength increased Full marks: 4 2. which of the following is not true of the description of waterproof material? A. three yuan ethylene propylene rubber waterproof roll is a new type of high-grade synthetic polymer waterproof coiled material. It has excellent properties and is widely used in waterproof engineering with high waterproof requirement and long service life B. SBS modified asphalt waterproofing membrane is widely used in various building waterproof and moistureproof projects, especially for cold areas C. polymer modified asphalt waterproofing membrane can be made of two kinds of tread, glass fiber felt and polyester felt, in which glass fiber felt has good tensile properties and high elongation D. asphalt felt has low tensile capacity, poor deterioration and poor durability. It is a waterproof material for limiting the use of felt Full marks: 4 3. there is a white powdery cementitious material in the warehouse. It may be one of lime, gypsum and white cement. It can be distinguished by a simple and quick method A. send laboratory analysis B. heat up to 120 degrees centigrade C. heat up to 50 degrees centigrade D. add the right amount of water to stir Full marks: 4 assignments, the answer did not upload, first for everyone to review the use, if you need to answer the specific, look at my registration name to find 4., a large volume of concrete works should not be used. A. Portland cement B. slag cement C. volcanic ash cement D. fly ash cement Full marks: 4 5. the strength grade of fired common bricks is evaluated by (). A. compressive