水泥混凝土的抗压强度以什么为准?
参考答案:
混凝土抗压强度试件以边长为150mm的正方体为标准试件,混凝土强度以该试件标准养护到28天,按规定方法测得的强度为准。
— What did your parents think about your decision?
— They always let me do _______I think I should.
A.when
B.that
C.how
D.what
简述国际金融市场及其分类。