空矩阵不同的尺寸相同吗？

Are null matrices of different dimensions equal?

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据报导，该产品计划十一月推出，大概与苹果的平板尺寸相同。

The device is scheduled for launch in November, according to reports, and will be roughly the same size as Apple's device. RIM has already acquired the rights to the blackpad.com internet domain.

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为了您的孩子的安全，使用尺寸相同的婴儿床和床垫。

For your child's safety use a cot and mattress of the same size.

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