對於鋼筋混凝土，對於普通重量骨料製成的混凝土，應使用的最低等級為C20

對於鋼筋混凝土，對於普通重量骨料製成的混凝土，應使用的最低等級為C20

Results (English) 1:

For reinforced concrete, concrete made for ordinary weight aggregate, the lowest level should be used for the C20

Results (English) 2:

For reinforced concrete, for concrete made of common weight aggregates, the minimum grade should be C20

Results (English) 3:

For reinforced concrete and for concrete made of ordinary weight aggregate, the minimum grade to be used is C20