第7题: [单项选择]A. It could be a positive outlet of aggression. B. It could offer more opportunities to compete. C. It was a good way to keep children calm. D. It was an outlet of children’s depression. 参考答案:A 答案解析:[解析] Q: What did one part of the sur、rey indicate about regular game use
第14题: [单项选择]水库通过与库外相通的、具有渗漏性的岩土体长期向水库下游、库外邻谷或洼地渗入而产生的渗漏称为()。 A. 季节性渗漏 B. 突发性渗漏 C. 暂时性渗漏 D. 永久性渗漏 参考答案:D 答案解析:水库渗漏主要有暂时性渗漏和永久性渗漏两种形式。暂时性渗漏是指水库蓄水初期,库水渗入库周不与库外相通的未饱和岩体中的孔隙、裂隙和喀斯特洞穴中,一旦含水岩体饱和即停止入渗,库水位回落时,部分渗入水体可回流