A.人走路
B.皮球在地面上滚动
C.皮带水平匀速传输物体
D.卷笔刀卷铅笔
答案:D
This morning he was late for school because the bus was too ____ for him to get on.[ ]
A. awful
B. crowded
C. relaxing
D. funny
不同的布料方法决定炉喉内不同的炉料状况,这种状况在炉料下降过程中()。
A、大体保持矿焦层不变
B、矿焦混在一起
C、矿石因比重大,超越焦炭之前
D、焦炭因比重小,超越矿石之前