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【多选题】
当外界因素(介质的pH、电场电压、介质中离子强度、温度等)确定后,决定蛋白质在电场中 泳动速度快慢的主要因素是A.
蛋白质所带电荷的数量
B.
蛋白质分子颗粒的大小
C.
蛋白质分子颗粒的形状
D.
蛋白质的pI
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【简答题】The human body is a living machine, and, like all machines, it needs "fuel" ( 燃料 ) to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy? The energy va...
【多选题】Questions 1—5 are based on the following passage. You need to complete the article with the sentences at the end of this section. There are two extra sentences that you do not need to use. 1.______ Th...
A.
Your body uses the food you eat to help you grow, to provide you with energy, and to help you fight against infection and disease.
B.
Another important task of food is to provide your body with energy, which you need for activities such as walking, swimming, skating, and dancing.
C.
In order to live, you need nutrients-nourishing substances that enable the cells of your body to work.
D.
People’s diet varies greatly throughout the world.
E.
If you eat foods from each of the first five four groups (not the fatty and sugary foods) everyday, you should have no problem staying healthy.
F.
A diet that give you the right amount of nutrients and calories is a balanced diet.
G.
How should we get all the nutrients we need in a day.
【简答题】电气控制电路中,交流接触器的主触头连接在电动机 电路上;辅助常开触头和辅助常闭触头通常连接在电动机 回路中。
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【简答题】阅读理解。 The human body is a living machine, and, like all machines, it needs 'fuel' (燃料) to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy? The energ...
【简答题】In the body part, the first paragraph we often ______________; the second paragraph we can write _________; the last paragraph usually _____________. (use the correct form of the word)
【简答题】The human body is a living machine, and, like all machines, it needs 'fuel' （燃料） to supply it with energy．This is provided by the food we eat．But how much do we need to stay healthy? The energy value ...
【简答题】The human body is a living machine, and, like all machines, it needs “fuel” to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy? The energy value of ...
【简答题】电气控制电路中,交流接触器的主触头连接在电动机 电路上;常开辅助触头和常闭辅助触头通常连接在电动机 回路中。
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