检修掘进机时，严禁怎样？
参考答案：
严禁其他人员在截割臂和转载桥下方停留或作业。
当光从一种介质斜射入另一种介质时，（1）______（2）______（3）______（4）______．
Since Tom _____ downloaded a virus into his computer, he can not open the file now. [ ]
A. readily
B. horribly
C. accidentally
D. irregularly
