设函数f(x)在(-∞,+∞)内连续,其导数图形如图所示,则在(-∞。,+∞)内
A.函数,f(x)有三个极值点,曲线y=f(x)有两个拐点.
B.函数,f(x)有四个极值点,曲线y=f(x)有一个拐点.
C.函数f(x)有三个极值点,曲线y=f(x)有一个拐点.
D.函数f(x)有四个极值点,曲线y=f(x)有两个拐点.
下列氨基酸中,属于酸性氨基酸的是
A.精氨酸
B.甘氨酸
C.亮氨酸
D.天冬氨酸
机体受到刺激而发生应激反应的系统是
A.下丘脑-腺垂体-肾上腺皮质系统.
B.下丘脑-神经垂体系统
C.交感-肾上腺髓质系统
D.迷走-胰岛素系统
The new form. of segregation in Paragraph 3 means that______.
A.the black and white are confined separately in the prison
B.the black is shut away from the mainstream society
C.many black people are locked in prison located in white community
D.many black people released from the prison stay in white community
肉眼类型多为弥漫型的肺癌是
A.鳞状细胞癌
B.小细胞癌
C.中分化腺癌
D.细支气管-肺泡细胞癌
患者,男,45岁。4小时前感上腹部胀痛伴恶心,呕吐一次为胃内容物,l小时以来右侧腹痛,有便意但未能排便,疑似急性阑尾炎。下列体征中,对确诊最有价值的是
A.体温37.8℃
B.McBurney点压痛
C.腰大肌征阳性
D.Rovsing征阳性