康明斯KTA-19G2柴油机的正时调整时，喷油提前角标准检测点为活塞距上止点前（）曲轴转角。
A.15°
B.19°
C.5°
D.以上都不是
参考答案：B
Nearly three months had gone by ______ the seriously injured girl showed a slight sign of recovery.
A．until
B．after
C．since
D．before
票据行为包括哪几种？
