It's of+n.是否=It's+adj

是的2. be of +名词，还可用来说明句子主语在度量，大小，颜色，类别等方面的特征。这类名词有 colour, age, size, height, weight, shape, type， kind等。在这类名词前常用different, all, the same， this, that, a(n) + 形容词等词来修饰或说明。如：

Coins may be of different sizes, weights, shapes, and of different metals.

货币可能在大小、重量、形状和铸造的金属方面都有所不同。

These pens are of many different colours.

这些笔有许多不同的颜色。

The two rooms are of a size / of the same size.

这两个房间大小一样。

He is of the same weight as his brother.

他和他弟弟一样重。

The productive forces were of a very low level.

生产力处于非常低的水平。

City Lights and Modern Times were of this kind.

“城市之光”和“摩登时代”就是这种影片。

注意：此类句型中的某些表达可以转换成 “be + different / the same + in + 抽象名词” 的形式。如:

Coins may be different in size, weight, shape, and metal.

These pens are different in colour.

The two rooms are the same in size.

可以啦
比如
it is import