There is a ___________ shop. It sells bananas, apples, pears and oranges.
①MgSO4溶液 ②Na2SO4溶液 ③饱和澄清石灰水 ④Ca(HCO3)2溶液 ⑤CuSO4溶液 ⑥饱和NaCl溶液.
关于国际合作的说法正确的是( )