[单选] According to Maritime Labour Convention, 2006, The minimum age at the time of the initial entry into force of this Convention is （）years.

黄河流经的地形区，按上游至下游的顺序排列，正确的为：（） ①青藏高原 ②华北平原 ③黄土高原 ④内蒙古高原 ①②③④。 ①④③②。 ①④②③。 ②③④①。 什么叫主导因素？ According to Maritime Labour Convention, 2006, the minimum age at the time of the initial entry into force of this Convention is 16 years Night work of seafarers under the age of （）shall be prohibited. 18。 16。 22。 20。 调度通信调度员对车站值班员为（）通信。 按照国家小麦质量标准，仓储小麦含水量不超过（） 12%。 13%。 14%。 15%。 According to Maritime Labour Convention, 2006, The minimum age at the time of the initial entry into force of this Convention is （）years.