①——6.72；②——0.06；③——140.09；④——0.028
Maybe you have been to many countries, but nowhere else _____ such a beautiful palace.
A．can you find
B．you could find
C．you can find
D．could you find
普通混凝土和易性最敏感的影响因素是( )。
A．砂率 B．骨料品种C．水泥浆 D．骨料品质
