You are on an ice-reinforced vessel about to enter packice. You should（）.
A. enter the pack on the windward side where there is a well defined ice edge
B. trim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcement
C. take maximum advantage of coastal leads caused by offshore winds
D. look for areas of rotten ice and enter perpendicular to the ice edge
A flashing green light displayed at a single lock means that the lock is（）.
A. ready for entrance
B. ready for entrance，but gates cannot be closed completely
C. being made ready for entrance
D. not ready for entrance
定额时间包括：作业时间，准备与结束时间，布置工作时间，休息和（）时间
A. 故障
B. 机器保养
C. 生理需要
D. 机器调试
国家标准规定公差分为20级即IT01、IT00、ITl……ITl8，其中IT01精度最低，ITl8精度最高。
A. 正确
B. 错误
微信支付 
支付宝支付