自体输血杜绝了抗体抗原免疫反应所致的溶血、发热和过敏反应,没有传染疾病的危险。()
参考答案:对
设M满足{1,2,3}⊆M⊆{1,2,3,4,5,6},则集合M的个数为( )
A.8
B.7
C.6
D.5
Here are some books for_______ sister and_______ .
A.his , he
B.my, I
C.their ,they
D.her, her