在下列地点中，昼夜长短变化幅度最大的是（） 广州。 上海。 北京。 哈尔滨。
Which one of the following information can not be found in engine room induction according to the passage?（） special precautions to deal with heat。 engine room safety procedures such as earmuffs, safety glasses, work clothes。 emergency escapes。 the location of safety equipment around the shi。
As the temperature of an air mass decreases，the（）. absolute humidity decreases。 relative humidity increases。 specific humidity decreases。 dew point rise。
As the South Equatorial Current approaches the east coast of Africa，it divides with the main part flowing south to form the warm（）. Agulhas Current。 Canary Current。 Benguela Current。 Madagascar Current。
在扑救液化气罐火灾时，扑救人员不得站在气罐两头。
Which one is true as regards to the hard hat according to the passage?（）
