Which of the following description of sweat glands is wrong ?

A、Theductsofmerocrinesweatglandopenatthesweatporeoftheskinsurface.;
B、Thesecretoryportionofmerocrinesweatglandsiscomposedofstratifiedcuboidalepithelium.;
C、Thesecretionofmerocrinesweatglandmainlycontainswater,sodiumchloride,ureaanduricacid.;
D、Thesecretionofapocrinesweatglandisregulatedbysexhormone.