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【多选题】
下列氨基酸那些是蛋白质的组分A.
His
B.
Trp
C.
瓜氨酸
D.
胱氨酸
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举一反三
【简答题】液压传动中最重要的参数是（）和（），前者代表（），后者代表（），而二者的乘积则是（）。
【单选题】听力原文： The Red Cross is an international organization which cares for the people who are in need of help. A man in a Paris hospital who needs blood, a woman in Mexico who was injured in an earthquake, ...
A.
Red Cross workers are in many countries.
B.
Red Cross only exists in the United States.
C.
Red Cross is another name for world hospital.
D.
Many people who are in need work in Red Cross.
【简答题】在某些晶体的极化方向施加外电场，晶体本身将产生机械变形，当外电场撤去后，变形也随之消失，这种物理现象称（）效应。
【单选题】听材料，回答下列问题：
A.
People who are learning a new language.
B.
People who use two languages in their lifetime.
C.
People who study the rules of the language.
D.
People who teach children to use a language.
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