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【单选题】
乳蛋白质中, 约占牛乳蛋白质的 80%A.
乳清蛋白
B.
酪蛋白
C.
乳球蛋白
D.
乳胶蛋白
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】关于子类型的描述中,( )是错的。
A.
子类型就是指派生类是基类的子类型
B.
一种类型当它至少提供了另一种类型的行为，则这种类型是另一种类型的子类型
C.
在公有继承下，派生类是基类的子类型
D.
子类型关系是不可逆的
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A.
一种特殊符号
B.
一种特殊的文本框
C.
含有提示信息的对象框
D.
在所有的幻灯片版式中都存在的一种对象
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A.
which; which
B.
which; that
C.
that; which
D.
that; what
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