已知:a=-a,则数a等于( )
A.0
B.-1
C.1
D.不确定
因为a=-a,
所以a+a=0,即2a=0,
则a=0,
故选:A.
Jane's pale face suggested that she ____ ill, and her parents suggested that she ____ a medical examination. [ ]
A. be; should have
B. was; have
C. should be; had
D. was; has
女性,32岁,因急性失血需要输血,当输入红细胞悬液约200ml时,突然畏寒,发热,呕吐一次,尿呈酱油样,血压75/45mmHg
该患者可能出现了()
A.过敏反应
B.溶血性输血反应
C.非溶血性发热性输血反应
D.细菌污染反应
E.循环超负荷