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【简答题】
请从温度、浓度、发酵工艺和反应器类型等角度阐述农村户用沼气的主要工艺。
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【简答题】Read and answer. 阅读短文，回答问题。 Miss Zhang, Lin Tao and Wei Xuan arrive in Beijing at nine o'clock in the morning. The weather is fine. They are tired and hungry. They take a cab to their hotel. After lun...
【简答题】触发器与存储过程不同,触发器的执行由( )触发。
【简答题】Zhang Wei is at the duty-free shop. He asked the salegirl Cassie to recommoend some gifts for his tourists. Listen to the conversation and fill in the blanks with what you hear.
【单选题】钢轨探伤仪测距为纵波声程250mm，用70°探头发现钢轨内有一斜裂纹回波3.2～4.4格，则该裂纹距探测面的垂直距离约为（ ）。
A.
75mm
B.
41mm
C.
27mm
D.
15mm
【简答题】在动物世界中,谁是作者眼中的“无双的垃圾回收者”?
【单选题】超声波探伤仪测距为横波声程200mm，用0°探头发现钢轨内有一缺陷显示于4格，则缺陷距探测面的垂直距离为()
A.
73mm
B.
90mm
C.
120mm
D.
146mm
【简答题】阅读理解。 Dear Lisa, Last Monday was a school holiday. My friends and I had a great day at the Zhongshan Park. The park is very big. We can do many things there. I flew kites with John and Zhang Peng, Jac...
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