采油速度的定义是（）
A.年产油量与可采储量之比
B.年产油量与地质储量之比
C.日产油量与地质储量之比
D.日产油量与地质储量之比
参考答案：B
His plan _____ when it was put into practice because he had not given enough attention to details.
A．broke down
B．broke up
C．broke out
D．broke away
对处于不同周期时相的细胞，对热疗最敏感的细胞期是（）。
A.G1期
B.S期
C.G2期
D.M期
E.各期细胞敏感性相同
