例句與造句

1. Reversed phase columns are quite difficult to damage compared with normal silica columns; however, many reversed phase columns consist of alkyl derivatized silica particles and should "'never "'be used with aqueous bases as these will destroy the underlying silica particle.
2. Reversed phase columns are quite difficult to damage compared with normal silica columns; however, many reversed phase columns consist of alkyl derivatized silica particles and should "'never "'be used with aqueous bases as these will destroy the underlying silica particle.
3. It's difficult to find reverse phase column in a sentence. 用reverse phase column造句挺難的