问题
问答题
简述硅酸盐水泥的特性。
答案
参考答案：(1)强度等级高，强度发展快。
(2)抗冻性好。
(3)耐腐蚀性差。
(4)水化热高。
(5)抗碳化性好。
(6)耐热性差。
(7)干缩小。
(8)耐磨性好。
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简述硅酸盐水泥的特性。
参考答案：(1)强度等级高，强度发展快。
(2)抗冻性好。
(3)耐腐蚀性差。
(4)水化热高。
(5)抗碳化性好。
(6)耐热性差。
(7)干缩小。
(8)耐磨性好。
John is a famous writer now. Bob said he was not a good student ___1_____ he was young. He was often late for____2___ and didn’t like doing his homework. Sometimes, he ______3____ in class while the teacher was teaching. He didn’t understand much, ____4____but he always thought he understood everything. One day the teacher ___5___ the students a question, “When Jack was ten years old, _____6____ brother Ben was twenty. Jack is fifteen now and _____7___ is his brother Ben? John said, “That’s easy. Ben is twice as old as Jack, so he is thirty now.” Another time, the ____8_____ in a science class asked, “When it thunders(打雷), __9___ do we always see the light before we hear the sound?” “But, Miss,” said John quickly, “don’t you ___10_____ our eyes are in front of our ears?”
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