瓦材防水屋面如何分类
参考答案：瓦类防水屋面分类有：平瓦屋面、油毡瓦屋面、波形瓦屋面、压型钢板等防水屋面。
儿童孤独症患者的社会交往障碍可以表现为（）
A.分不清与人的亲疏关系
B.与人相处时缺乏目光对视
C.难与同龄儿童建立正常伙伴关系
D.难与父母建立正常的依恋关系
E.受到爱抚时缺乏相应的愉快表情
Our government has protested time and again that any increase in arms sales to Taiwan
is____________ the US government's_______________ the Chinese people but
the US government just turns a deaf ear to our protest. [ ]
A. breaking; promise
B. violating; commitment to
C．damaging；promise of
D. breaking; commitment with
