鉴别肝源性或心源性腹水的最可靠体征是()
A.心界叩诊改变
B.肝肿大
C.下肢水肿
D.颈静脉怒张
E.脾肿大
参考答案:D
A ( ) consists of the symbols, characters, and usage rules that permit people to communicate with computer.
A.programming language
B.network
C.keyboard
D.display
中国的文官制度和科举制度有什么优点?对西方国家有什么影响?