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问题 报关编码

聚酰胺一6，6长丝制的单丝，截面直径0.8毫米，细度50分特，未加捻

答案

参考答案：54024520

选择题
若直线3x-4y+12=0与两坐标轴的交点分别为A、B，则以线段AB为直径的圆的标准方程为（　　）
A．(x-2)2+(y+
3
2
)2=
25
4
B．(x+2)2+(y-
3
2
)2=
25
4
C．(x+2)2+(y-
3
2
)2=25		D．(x-2)2+(y+
3
2
)2=25
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单项选择题

—This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.

A. may



B. must
C. should



D. could
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