【单选题】下列说法正确的是( )
A.
一定温度压强下,△H<0、△S>0的反应一定能自发进行
B.
铅蓄电池放电时的负极和充电时的阴极均发生还原反应
C.
为保护浸入海水中的钢闸门,可将闸门连接到直流电源的正极上
D.
一定温度下,反应:2A(g)+B(g)?2C(g),增大压强反应速率加快,A的浓度减小
【单选题】To___on a market with the established brands,your product must be very___,both in quality and in price.
D.
competitive , competition
【判断题】草履虫在有光情况下进行光合营养,无光情况下进行吞噬营养。
【简答题】(8分)将锌片和银片浸入100 mL 1mol·L ―1 稀硫酸中组成原电池。 (1)写出锌片和银片上的电极反应方程式? (2)若该电池中两电极的总质量为6g,工作一段时间后,取出两极洗净干燥后称量质量为4.7g,试计算:①通过导线的电子的物质的量?②工作一段时间后, 溶液中的H + 的物质的量浓度?(设溶液的体积不变)
【单选题】The efficiency and speed of motor vehicles allow a nation's agriculture to be established throughout the nation's territory.
【多选题】Which of the following brands are included in Britain's Intercontinental Hotels?
【单选题】Established brands such as those discussed above need careful treatment if the brand indentity is to be maintained. 'those' refers to ________.
A.
Shell company's brand evolution
B.
Coca-Cola company's logo abbreviation
D.
small evolution of Shell logo and abbreviation of Coca-Cola name