钢筋必须严格分类、分级、分牌号堆放；不合格的钢筋另做标识，分开堆放。
参考答案：对
根据句意填写单词，完成句子。
1. The boy isn't David. ______ is Jim.
2. My father's sister is my ______.
3. ______ me, is Jim your brother?
4. Linda is my ______ and I'm her mother.
5. Tommy's father and mother are his ______.
心房颤动时，心电图鉴别室性早搏与心室内差异传导，下列哪项最有帮助（）
A.异常QRS波群前长间隙
B.以上都不是
C.起始向量
D.异常QRS波群呈右束支阻滞图形
E.室性融合波
