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【多选题】
导致钻孔灌注桩施工中断桩的原因有（ ）。A.
混凝土坍落度太小，骨料太大，运输距离过长，混凝土和易性差
B.
计算导管埋管深度时出错，或盲目提升导管，使导管脱离混凝土面
C.
钢筋笼将导管卡住，强力拔，使泥浆混入混凝土中
D.
桩底不彻底
E.
导管接头处渗漏，泥浆进入管内，混入混凝土中
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皮皮学刷刷变学霸
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【单选题】A frail, elderly man, suspected of having widespread cancer of the lungs and bronchi, is brought in for bronchoscopic examination. The instrument is inserted into the airway, where it accidentally pun...
A.
Azygos vein
B.
Left brachiocephalic artery
C.
Pericardiacophrenic artery
D.
Right pulmonary vein
E.
Superior vena cava
【简答题】（14分）某研究性学习小组设想将少量Cl 2 通入Fe 2+ 和I - 的混合溶液，来探究Fe 2+ 和I - 的还原性强弱。 【提出假设】 假设1： ； 假设2： ； 假设3：Fe 2+ 和I - 的还原性一样强。 【验证假设】 ⑴利用以下装置进行试验， 实验必需的装置是：A (按氯气流向的顺序用序号书写) ⑵实验开始后，控制通入少量氯气，通过观察溶液颜色的变化， (能或不能)判断反应的先后顺序...
【单选题】Look at the four squares that indicate where the following sentence could be added to the passage. Frenchman Jean Pierre Christin (1683～1755) placed an order with instrument makers Pierre Casati for t...
A.
Square Ａ.
B.
Square Ｂ.
C.
Square Ｃ.
D.
Square Ｄ.
【单选题】Section C Passage Directions: In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only o...
A.
It has kept growing over the centuries.
B.
Its top is hidden in clouds of volcanic smoke.
C.
Its height changes with each volcanic eruption.
D.
It has a recorded history of 1,500 years.
【简答题】Who invented the earliest instrument to tell people where earthquakes happened?
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