提速货物列车列检技术作业要求车轮辐板及辐板孔（）。
A.裂纹不大于0.5mm
B.裂纹不大于lmm
C.裂纹不大于1.5mm
D.无裂纹
参考答案：D
Eric received training in computer for one year, _____ he found a job in a big company.[ ]
A. after which
B. after that
C. after it
D. after this
It’s snowing heavily, so there is a lot of snow all ______ the ground.
A．above
B．over
C．on
D．in
