High-speed operation and rough handling of covers are dangerous.()
A:高速操作和野蛮开关舱是危险的
B:高速和野蛮操作舱盖是危险的
C:低速操作和野蛮开关舱是危险的
D:低速和野蛮操作舱盖是危险的
出自:船舶水手证