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【单选题】
施工所需的混凝土拌合物坍落度的大小主要有( )来选取。
A.
水灰比和砂率
B.
水灰比和捣实方式
C.
骨料的性质、最大粒径和级配
D.
构件截面尺寸大小，钢筋疏密，捣实方式
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】句子配对。(从第II栏中找出第I栏中的答语) I (     )1. Is he Chinese or Japanese? (     )2: Who's on duty today? (     )3. Are those oranges? (     )4. Can you see the bird? (     )5. Is it a car? (     )6. Who are they?...
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