I
см. тж. целесообразно
• Before beginning this task it would be well ( or we would do well ) to consider ...
• It turns out to be profitable to deal with ...
• It is worthwhile to be able to predict whether or not ...
• It is helpful ( or advisable , or useful ) first to consider a simpler system.
• It is good ( or sound ) practice [ or It is wise ( or well )] to rinse off the solution.
• It may be beneficial ( or useful , or expedient , or advantageous ) to reduce the mass velocity.
II
• To see the relative role of ... , it is instructive to compute these parameters for a 1 metre cuvette.