金瓷修复体瓷层覆盖的金属基底表面应保留的空隙为()
A.0.1~0.2mm
B.0.2~0.3mm
C.0.3~0.5mm
D.1~1.5mm
E.1.5~2mm
参考答案:E
()是土地的本质属性和质量标志。其包括自然肥力和人工肥力。
Our goods ( ) best quality and lowest price.
A.are
B.with
C.are of
D.is of