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【简答题】
利用示波器测量交流电压时将Y轴输入耦合开关置于 位置。如交流信号的频率很低,则Y轴输入耦合开关置于 位置。
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【简答题】Miss Grey lived in a small house. She was old and did not like noise at all , so she was very pleased when her noisy neighbour moved out .A young man moved in and Miss Grey thought the man seemed to b...
【简答题】Once upon a time there lived a woman who had a bad temper(脾气). She 1 at everyone around her. For most of her life she believed the anger inside her was 2 else’s fault(过错). She went to see a wise monk(...
【单选题】—Did you tell him where she ______? —Yes. And I also told him she ______ until the next month.
A.
had gone wouldn't come back
B.
has gone won't come back
C.
had been wouldn't come back
D.
went didn't come hack
【简答题】It was just three degrees above zero. “That’s cold,” thought Jane as she got ready to deliver her morning papers. Jane had 50 customers, and on cold mornings when she couldn’t ride her bicycle, it too...
【单选题】What happened to Jenkins on her 56th birthday?
A.
She was stabbed with a knife.
B.
She lost more than 100 pounds.
C.
She had surgery.
D.
She began to float.
【多选题】热着火与链式着火的区别主要有()
A.
热着火需要良好的保温条件，而链式着火不需要严格的保温条件
B.
热着火过程中系统的温度整体上升，链式着火过程局限在活化中心的生成速率大于销毁速率的区域。
C.
热着火的强度较大，链式着火的着火强度不高。
D.
热着火过程中化学反应速度加速，而链式着火过程化学反应速度不变。
【简答题】试述大脑动脉环（Willis环）的组成。
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