【单选题】You probably know about the Titanic, but it was actually just one of three state-of-the-art (先进的) ocean ships back in the day. The Olympic class ships were built by the Harland & Wolff ship makers in ...
A.
They performed marvellously on the sea .
B.
They could all break the ice in their way .
C.
They all experienced terrible misfortunes .
D.
They were models of modern engineering .
【单选题】Northern Ireland is the smallest of the four nations, but is quite well known in the world for __________?
A.
I t most famous landmark, the Giant Causeway
B.
I ts rich cultural life
C.
I ts low living standard
D.
I ts endless political problems
【简答题】(6分)现有HCl、NaCl、NaOH、Na 2 CO 3 等溶液。若进行下列实验,请判断可能的溶液组合。 (1)两两组合进行实验: ① 组合后无明显现象,但发生反应的组合是____________; 写出该反应的化学方程式为______________________。 ② 组合后有明显现象,该现象是__________________。 反应的化学方程式为___________________...
【判断题】赤潮是海洋浮游植物暴发性增殖或高度聚集而引起海水变成红色的一种有害生态现象。
【单选题】下列各项中,不属于其他业务收人的有( )。
【单选题】化学与人类的生活密切相关。下列有关化学物质的叙述不正 确的是 [ ]
A.
油脂属于酯类,除可食用外,还可用于肥皂生产和油漆制造
B.
人体缺碘易得“大脖子病”,为了消除碘缺乏病,目前加碘食盐主要添加的是KIO 3
D.
金属钛具有抗腐蚀性、熔点高、硬度大、密度小等优点,被誉为“21世纪的金属”