混凝土冬夏季拆模后，若天气发生骤然变化应采取何措施？
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If an emergency pump control is used as the emergency shutdown on a tank vessel，it must（）.
A. stop the flow of oil at the main deck manifold
B. prevent the oil from leaving the shore facility
C. prevent the oil from siphoning through the pump
D. None of the above
简述2，6-二氯靛酚滴定法测维生素C的含量的原理。与碘量法比较有何优点？
上级国家机关应当对各民族的干部和群众加强（）教育，经常检查民族政策和有关法律的遵守和执行情况。
A. 民族政策
B. 民族常识
C. 民族理论
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