Taiyuan, a city in North China, was struck by a heavy snow last week, _____serious traffic problems.

A．facing         B．faced    C．having faced       D to face

对左偏曲线进行精调采集数据时轨检小车双轮应放置在（）

A、左股

B、右股

C、基准股

D、调整股

E、左、右股交替