问题
单项选择题
下列关于红细胞血型抗原说法哪项不正确()
A．红细胞血型抗原分别属于高频率和低频率抗原
B．高频率抗原是指相应的抗体与999/1000以上的红细胞凝集
C．低频率抗原是指在一群体中频率不超过1/1000
D．红细胞ABO抗属高频率抗原
E．红细胞上Rh(D)抗原的血清学活性决定于存在的磷脂
答案
参考答案：C
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下列关于红细胞血型抗原说法哪项不正确()
A．红细胞血型抗原分别属于高频率和低频率抗原
B．高频率抗原是指相应的抗体与999/1000以上的红细胞凝集
C．低频率抗原是指在一群体中频率不超过1/1000
D．红细胞ABO抗属高频率抗原
E．红细胞上Rh(D)抗原的血清学活性决定于存在的磷脂
参考答案：C
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| I first saw the baby panda when she was only 10 days old. She looked like a white mouse. We 1 her Xi Wang. It means "hope". When Xi Wang was born, she was just 100 grams(克). Xi Wang drank her mother's milk for as 2 as 14 hours a day. When she was six months old, she started to eat bamboo shoots(嫩芽). Eight months 3 , she was not a small baby any more. She grew into a 4 young panda and weighed 35 kilos. When Xi Wang was 20 months old, she had to look after herself because her mother had another baby. Xi Wang has to live by itself. 5 , it is very difficult for pandas to live in the wild. Here are some problems that pandas like Xi Wang may have in the future. If hunters (猎人) catch a panda, they will 6 it for its fur(皮毛). If farmers 7 trees and forests, pandas will have no place _8 . When Mothers leave baby pandas 9 , people will often take them away. People think that the baby pandas need help. If pandas are in danger, we should try our best to protect them. If we do 10 , soon there will be no pandas in the world. | ||||
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