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【单选题】
欲使振荡电路能自行建立振荡,必须满足()的条件。A.
|AF|1
B.
|AF|=1
C.
|AF|1
D.
|AF|≤1
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【单选题】瘦肉精( Clenbuterol )是一种非常廉价的药品，对于减少脂肪增加瘦肉 ( Lean Mass )作用非常好。瘦肉精让猪肉的单位经济价值提升不少，但它有很危险的副作用，轻则导致心律不整，严重一点就会导致心脏病。瘦肉精是白色或类白色的结晶粉末，其结构简式为： 关于瘦肉精下列说法正确的是
A.
分子式为C 12 H 18 Cl 2 N 2 O
B.
该有机物核磁共振氢谱有7种类型氢原子的吸收峰
C.
该有机物不能发生氧化反应
D.
该有机物所含官能团有羟基、氯原子、苯环
【单选题】听力原文： The Titanic, With 2,300 passengers aboard, was on its first voyage from Southampton to New York. It was 11:40 p.m. on April 14th 1912 and the sea was calm. Suddenly the look-out man saw the enor...
A.
London.
B.
Washington.
C.
Southampton.
D.
New York.
【简答题】In order to work more efficiently, you need to have a to do list and after your tasks, cross them off your list.
【单选题】听力原文： The Titanic, with 2, 300 passengers aboard, was on its first voyage from Southampton to New York. It was 11:40 p. m. on April 14th 1912 and the sea was calm. Suddenly the look-out man saw the en...
A.
Southampton.
B.
New York.
C.
London.
D.
Paris.
【单选题】听力原文： The Titanic, with 2,300 passengers aboard, was on its first voyage from Southampton to New York. It was 11: 40 p.m. on April 14th 1912 and the sea was calm. Suddenly the look-out man saw the eno...
A.
London.
B.
Washington.
C.
Southampton.
D.
New York.
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