一个数是由6个一和4个十组成的，这个数是（ ）。
46
—Is this your eraser, Kangkang
—No, it isn't _______. It's _______. [ ]
A. my; your
B. mine: her
C. mine; his
D. my; yours
当保温层厚度超过（）时，应分为2层或多层逐层施工。
A．5mm
B．50mm
C．10mm
D．100mm
