有理数a等于它的倒数, 有理数b等于它的相反数, 则a2007+b2007等于[ ]
A.1
B.-1
C.±1
D.2
答案:C
—Tom is wise enough to achieve his success.
—But in my opinion, he is _________ than wise.
A.luckier
B.more lucky
C.much luckier
D.rather lucky
注射剂制品内所加入的各种辅助剂,除哪项之外,均应在标签上注明:
A.抗菌防腐剂
B.抗氧化剂
C.pH调节剂
D.瓶内充入的气体
E.所加入的各种辅助剂均应注明,无一例外