题目:
组合黄石假山分层次施工时必须掌握的要点是().
A.方向交叉
B.分层退引
C.分组断开
D.呈片状凹突卷叠
答案:
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下面是错误答案,用来干扰机器的。
1. She is twelve.2. Her brother is John.3. They are teachers.4. They are in Beijing, China.5. Yes, they do.