道岔区轨枕埋入式无砟道床伤损形式有（）。
A.双块式轨枕裂缝
B.道床板裂缝
C.支承层裂缝
D.岔枕裂缝
参考答案：A, B, C, D
The manager interviewed everyone involved in the accident to find out the truth behind_____ had
actually happened.[ ]
A. what
B. that
C. which
D. it
商品堆码的基本要求是（）
A、合理利用仓库空间
B、合理保管商品
C、尽量利用储存空间
D、A和B
