问题
单项选择题 A1型题
仔猪主要有心肌变性,猝死,桑葚心,肌红蛋白尿,心肌变性、色淡,似熟肉,灰黄色、黄白色的点状、条状;心内膜、外膜下有黄白色或灰白条纹。幼禽主要有贫血,冠白,腹下浮肿,呈紫色,俗称渗出性素质病,此疾病最可能是()
A.维生素
B.铜缺乏症
C.硒和维生素
D.钙缺乏症
E.磷缺乏症
答案
参考答案:C
仔猪主要有心肌变性,猝死,桑葚心,肌红蛋白尿,心肌变性、色淡,似熟肉,灰黄色、黄白色的点状、条状;心内膜、外膜下有黄白色或灰白条纹。幼禽主要有贫血,冠白,腹下浮肿,呈紫色,俗称渗出性素质病,此疾病最可能是()
A.维生素
B.铜缺乏症
C.硒和维生素
D.钙缺乏症
E.磷缺乏症
参考答案:C
Passage One
When does the speaker say that another significant change in instrument design took place
A.In the early 19th century.
B.In the late 19th century.
C.In the early 20th century.
D.In the mid-20th century.