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河南成教 / 有机化学
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下列试剂中
,
能用来鉴别苯酚的有(
)。
A.
三氯化铁
B.
溴水
C.
碳酸氢钠
D.
碘液
积分
有机化学
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佳题速递:
不属于材料物理性能的是 A.强度 B.硬度 C.热膨胀性 D.耐腐蚀性 E.
金属工艺学
[填空题] 混凝土预制方桩制作中,为节省场地,宜采用叠浇法,邻桩浇注时必须保证先浇邻桩的砼强度达到设计值的()。
土木工程施工
In the old days, divers used to go down into the sea looking for ships that had sunk, because they hoped to find gold and jewels. Now divers still search for valuable things in sunken ships, but they also try to bring to the surface the ships themselves, or parts of them. The value of different kinds of metals has increased greatly over the last twenty or thirty years and even though a ship has been under the sea for many years, it may be worth a great deal. One famous sunken ship is the "Lusitania", which sank off the southern coast of Ireland in 1915 with a loss of nearly, 1,500 lives. It has four huge propellers made of an expensive metal. Today each of those propellers is worth $ 300,000 or more. The ship lying on the sea-bed has been brought by a man called John Light. He paid about $ 1,200,000 for the whole ship. He hopes to bring up those propellers and sell them. He also hopes to sell other parts of the ship, when he has brought them to the surface, for about $ 600,000. (1)Divers today try to bring to the surface _ _ _ _ _ _ _ .(2分)A、gold and jewelsB、parts of shipsC、whole shipsD、all of the above(2)Diver try to bring up metals because _ _ _ _ _ _ _ _ .(2分)A、they have been in the sea for a long timeB、gold and jewels are not valuable thingsC、some kinds of metals are worth a lot of moneyD、it is easy to bring up metals(3)The word "surface" in the passage means the _ _ _ _ _ _ .(2分)A、marketB、airC、top of a liquidD、sea(4)John Light hopes that he may be able to sell all the parts of the "Lusitania" for about _ _ _ _ _ .(2分)A、$12,000B、$300,000C、$1,200,000D、$1,800,000(5)John Light bought the "Lusitania" _ _ _ _ _ _ _ .(2分)A、before 1915B、before it sankC、after it sankD、rafter they had brought up the propellers
新发展英语综合教程(二)
所谓时间定额是指在一定生产条件下规定生产多件产品或完成几道工序所需消耗的时间。
机械制造技术基础
下面属于相贯线的简化画法的是( ) A.不至引起误解时可以简化成圆弧或直线。 B.非圆曲线的相贯线可以简化为直线 C.采用模糊画法表示相贯线 D.以上三种都是 E.
工程图学
康复医学的最早起源是 A.化学治疗 B.物理治疗 C.药物治疗 D.手术治疗 E.
康复医学
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