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【单选题】
关于体内酶促反应特点的叙述，错误的是)A.
只能催化热力学上允许进行的反应
B.
可大幅降低反应活化能
C.
温度对酶促反应速度没有影响
D.
具有可调节性
E.
具有高催化效率
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【单选题】In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt.”, the 'piston ring belt' means _____.
A.
piston crown
B.
piston ring groove
C.
piston skirt
D.
piston ring area
【简答题】The oil pan is usually formed of pressed steel. It usually holds 5 to 10 liters of oil, depending on the engine design .The oil pan and the lower part of the cylinder block together are called the cra...
【简答题】（10分） （1）① 写出Na 2 SO 4 的电离方程式 。 ② 氧化铝和氢氧化钠溶液反应的离子反应方程式 。 ③ OH - + H + ='=' H 2 O改写为化学方程式 。 （2）粗盐中含可溶性CaCl 2 、MgCl 2 及一些硫酸盐，除去这些杂质的试剂可选用，①Na 2 CO 3 、②NaOH、③BaCl 2 、④HCl ,用序号表示加入的先后顺序是 。 （3）下列实验操作中不正确的是...
【单选题】In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to _____ and heated.
A.
a service tank
B.
a settling tank
C.
an expansion tank
D.
a double bottom tank
【单选题】Which of the following is NOT the author's purpose of mentioning the oil crises in the 1970's?
A.
To prove that water is as expensive as oil.
B.
To warn the world of a possible water supply crisis.
C.
To call people's attention to the importance of energy conservation.
D.
To shock the people of the world into saving water.
【简答题】The oil pan is usually formed of pressed steel. It usually holds 5 to 10 liters of oil, depending on the engine design .The oil pan and the lower part of the cylinder block together are called the cra...
【简答题】The oil pan is usually formed of pressed steel. It usually holds 5 to 10 liters of oil, depending on the engine design .The oil pan and the lower part of the cylinder block together are called the cra...
【简答题】写出干氧氧化和水汽氧化的化学反应式。
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