初温和质量都相同的铜块和铁块,吸收相同的热量后,将它们相互接触,则[ ]
A.它们之间不发生热传递
B.热由铜块传给铁块
C.热从铁块传给铜块
D.无一定规律
答案:B
Not until yesterday that I had made a serious mistake.
A.didn’t I realize
B.did I realize
C.I didn’t realize
D.I realize
成人硬膜外应用丁哌卡因极量为
A.225mgB.150mgC.400mgD.100mgE.250mg