下列哪一项可能会造成掘进机截割头不转动（）。
A.未开喷雾
B.油压不够
C.截割过负荷
参考答案：C
The boy’s foolish question ______ his mother who was busy with housework and had no interest in talking.
A．intrigued
B．fascinated
C．irritated
D．stimulated
用雷达观测法实测风流压差，调整电子方位线与固定孤立物标相对运动轨迹平行，如电子方位线偏在航向线右面5°，罗经差2°W，则实测风流压差为（）。
A．＋5°
B．－5°
C．＋3°
D．－3°
