x=13时，52x=52×13=152．
故答案为：152．
As a young man, Comrade Zhou Enlai ________the student's movements and later ________the Communist Party of China.
A．joined; take part in
B．took part in; joined
C．joined in; took part in
D．joined; joined in
现代医学模式产生的背景是( )
A．以下都正确B．人类面临的疾病谱与死因谱发生变化C．人类健康需求的与日俱增D．医学科学与相关科学的相互渗透E．健康影响因素的多元化
