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【简答题】
氨基酸在高于其等电点的环境中带 ,在低于其等电点的环境中带 。
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】男，59岁，冠心病20年。某日突然神志丧失，呼吸不规则，即刻进行心肺复苏，心脏按压时下压胸骨的深度是( )。
A.
1～3cm
B.
4～5cm
C.
5～6cm
D.
6～7cm
E.
7～8cm
【单选题】Passage 2
A.
He visits the girl and her family.
B.
He goes back home.
C.
He visits his friends.
D.
He calls the girl.
【多选题】在 HTML 中，以下关于 元素的属性说法正确的是 ( )( 选择二项 )
A.
type执行表单元素的类型，默认为text
B.
size执行表单元素的初始宽度，大小必须以字符为单位
C.
checked指定单选按钮或浮选框是否被选中
D.
maxlength指定可在text或password元素中输入的最大字符数，默认为100
【单选题】Passage 2
A.
They were often too generous.
B.
They often spoiled him too much.
C.
They made him go off to university.
D.
They made him follow their rules.
【单选题】Passage 2
A.
Visit their neighbors.
B.
Eat out with their families.
C.
Stay at home with their families.
D.
Go out with co-workers.
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