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【单选题】
In a small-signal transistor, the typical range of the parameter β is ( ).
A.
greater than 100
B.
between 0 and 100
C.
almost equal to 100 but always less than 100 (90 to 100)
D.
large and in the range of about 50 to 400
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举一反三
【简答题】A) have happened B) happens C) happened D) had happened
【判断题】农业与牧业间的相互依赖使国家容易统一。
A.
正确
B.
错误
【判断题】从历史地理学的角度来看,农业与牧业间的相互依赖使国家容易统一。()
A.
正确
B.
错误
【单选题】What ____ him on his way to school yesterday? [     ]
A.
happened
B.
happened to
C.
was happened
D.
was happened to
【简答题】后牙的颊舌尖在咀嚼运动中具有不同的功能,上后牙 ______ 尖和下后牙 ______ 尖为支持尖,与对颌牙颌面窝沟相对应;上后牙 ______ 尖和下后牙 ______ 尖为引导尖,主要作用是引导侧向咬合运行。
【判断题】从历史地理学的角度来看,农业与牧业间的相互依赖使国家容易统一。
A.
正确
B.
错误
【单选题】We  ________in the neighborhood. [     ]
A.
happened being
B.
happened be
C.
happened to be
D.
are happened to be
【单选题】I _ have no money on meyesterday. [     ]
A.
happened
B.
happened to
C.
happened to be
D.
happened that
【单选题】千颂伊按错都敏俊家的密码是?
A.
2832
B.
0423
C.
2018
D.
1911
【单选题】在空调系统中,冷凝器的作用是 :
A.
、增强散热器的制冷效果
B.
、为空调系统提供泄压
C.
、液化压缩机排出的高温高压气体
D.
、液化蒸发器排出的高温高压气体
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