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【单选题】
新鲜水果、蔬菜、乳制品中富含的维生素C具有明显的抗衰老作用，但易被空气氧化。某课外小组利用碘滴定法测某橙汁中维生素C的含量，其化学方程式为： 下列说法正确的是A.
上述反应为取代反应
B.
上述反应为还原反应
C.
滴定时应剧烈振荡锥形瓶
D.
脱氢维生素C的分子式为C 6 H 6 O 6
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【简答题】简述组织环境的特点。
【单选题】Every candidate for certification as electro-technical officer shall follow an approved programme of ______ which is adequately documented in a training record book.
A.
ashore training
B.
onboard training
C.
simulated training
D.
school training
【单选题】Every candidate for certification as electro-technical officer shall be required to demonstrate the ability to operate______.
A.
electrical, electronic and control systems
B.
automatic control systems of propulsion and auxiliary machinery
C.
generators and distribution systems
D.
personal computers
【单选题】Every candidate for certification as electro-technical officer shall be required to_______ the ability to undertake the tasks, duties and responsibilities listed in column 1 of table A-III/6.
A.
. demonstrate
B.
learn
C.
conceal
D.
gain
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