尿渗透克分子浓度()。
A.Posm
B.mOsm/kg
C.mOsm/L
D.COP
E.ECF
参考答案:C
镁砂粉常用于()铸件砂型涂料中的耐火填料。
A.合金钢
B.碳钢
C.高锰钢
D.灰铸铁
In relation to company law, explain and distinguish between:
(a) Companies limited by shares and companies limited by guarantee. (5 marks)