Periodic abstinence

Periodic abstinence may refer to:

单词	Periodic abstinence
释义	Periodic abstinence 英语百科 Periodic abstinence Periodic abstinence may refer to: The use of fertility awareness as birth control Following the Roman Catholic Church's teachings on natural family planning
随便看	internal electron dense granule internal electronic monitoring internal electron pair creation internal element internal e.m.f. internal emf internal emission line internal emitter internal emitter point internal emitter resistance internal emotion Internal enamel epithelium internal enamel epithelium,inner enamel epithelium internal enclosed stairway Internal endometriosis internal energ internal energies of bulk matter Internal energy internal energy balance internal energy function internal energy of reaction internal energy per unit mass internal engagement internal entropy internal enviroment