下列关于气水比的说法错误的是()。
A.产气量增加,气水比一定增大
B.用来分析气井产水量的变化
C.用以进行气井动态分析
D.产气量和产水量的比值
参考答案:A
Having taken our seats,_______________________.
A.the professor began the lecture
B.the lecture began soon
C.we were attracted by the lecture soon
D.the bell announced the beginning of the lecture
双子叶植物茎的维管束多为()维管束,在初生木质部和初生韧皮部间存在形成层,故又称()。