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【单选题】
集装箱以20英尺为标准尺寸，40英尺的集装箱换算为（ ）标准箱A.
1
B.
1.5
C.
1.8
D.
2
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举一反三
【单选题】There ought to be less anxiety over the perceived risk of getting cancer than ______ in the pub lie today.
A.
exists
B.
exist
C.
existing
D.
existed
【单选题】There ought to be less anxiety over the perceived risk of getting cancer than ______ in the public today.
A.
exists
B.
exist
C.
existing
D.
existed
【单选题】There ought to be less anxiety over the perceived risk of getting cancer than ______ in the public mind today.
A.
exists
B.
exist
C.
existing
D.
existed
【判断题】增益可调的放大电路如图所示。【图片】是增益调节电位器。已知【图片】【图片】【图片】，A为理想运算放大器。当【图片】的动端在中间时，输出电压【图片】＝0.5V。（）【图片】
A.
正确
B.
错误
【单选题】There ought to be less anxiety over the perceived risk of getting SARS that ______in the public mind today.
A.
exists
B.
exist
C.
existing
D.
existed
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