（）距井壁一定距离，岩石孔隙中钻井液滤液逐渐减少，原状地层流体逐渐增加，直至几乎没有钻井液滤液的原状地层。其电阻率符号为（）。
参考答案：过渡带；Ri
Had they known what was coming next, they second thoughts.
A．may have
B．could have
C．must have had
D．might have had
加聚反应过程中单体的键接顺序是（）连接。
A.不固定的
B.“头一头”
C.“头一尾”
D.“尾一尾”
