第19题: [单项选择]There is a loss of self-confidence, a sense of personal failure, great anger and a feeling of being utterly ______. A. let alone B. let out C. let down D. let on 参考答案:C 答案解析:[解析] 句子中的and说明,a loss of self-confidence,a sense of personal failure,great anger和a feeling of being
第27题: [单项选择]平屋顶和斜屋顶的坡度区分界限值是( )。 A. 2% B. 6% C. 10% D. 12% 参考答案:C 答案解析:[试题解析] 为了排除雨水,屋面必须设置坡度。坡度大则排水快,对屋面的防水要求可降低,反之则要求高。根据排水坡的坡度大小不同可分为干屋顶和斜层顶两大类,一般公认坡面升高与其投影长度之比<1:10时为平