John got beaten in the game, ____ had been expected. [ ]
A. as
B. that
C. what
D. who
答案:A
绿泥石、绢云母为浅变质带的指示矿物;蓝晶石为中变质带的特征矿物;矽线石则代表深变质带的产物。
潮流计算的内容有哪些?