___ was formed as a conduit for multilateral negotiations on a variety of international trade issues.

命令()可以使屏幕上X轴与Y轴的比例尺相同

A：axis(‘manual’)
B：axis([xminxmax])
C：axis(‘square’)或axis(‘equal’)
D：axisoff

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已知x为一个向量，计算ln(x)的运算为()。

A：ln(x))
B：log(x)
C：Ln(x)
D：log10(x)

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