职业健康安全事故分两大类是（）。
A、职业事故与执业病
B、职业事故与执业伤害病
C、职业伤害事故与职业病
D、伤害事故与职业病
参考答案：C
简述我国城市社区环境的现存问题。
During loading or discharging, the tallymen must make contact with（）on duty so as to solve problems in time.
A.ship owner
B.ship's officers
C.shippers
D.consignors
