Which statement about the preliminary design stage of a software development project is true ______.

A．The preliminary design is an internal document used only by programmers
B．The preliminary design is the result of mapping product requirements into software and hardware functions
C．The preliminary design of the product comes from the requirement specification
D．The developers produce the preliminary design by defining the software structure in enough detail to permit coding

患者．男，30岁。发热，有汗而热不解，头身困重，腹胀纳呆，大便不爽或下痢不止，肛门灼热，小便黄赤而不利，关节酸痛。舌红苔黄腻，脉滑数。治疗首选方

A．黄连解毒汤合清营汤

B．葛根芩连汤

C．温胆汤合桃红四物汤

D．五阴煎

E．知柏地黄汤合二至丸