求助except 题

GWD:

Tanco,a leater manufacturer,uses large quantities of common salt to preserve animal hides.New environmental regulations have significantly increased the cost of disposing of salt water that results from this use,and,in consequence,Tanco is consideing a plan to use potassium chloride in plac fo common salt.Research has shown that Tanco could reprocess the by-product of potassium chloride use to yield a crop fertilizr,leacing a relatively small volume of waste for disposal.

In determining the impacton company profits of using potassium chloride in place of common salt ,it would e importrant for Tanco to rsarch all of the following EXCEPT

A What difference,if any ,is there between the cost of common salt needed to preserve a given quantity of animal hides and the cost of the potassium chloride neded to presrve the same quantity of hides?

B To what extent is the equipment involved in preserving animal hides using common salt suitable for preserving animal hides using potasssum chloride?

C what environmental regulations,if any ,constrain the disposal of the waste generated in reprocessing the by-product of postassium chloride?

D How closely does leather that rsults when common salt is used to preserve hides resemble that which results when potassium chloride is used?

E Are the chemical properties that make potassium chloride an effective means for preseving animal hides the same as thous that make common salt an effective means for doing so ?

Answer :E

不明白这种EXCEPT题目怎么做，请NN们指教