试述尺寸链中增环和减环的判别方法。

中年男性患者，发热、黄疸。血清学检查HBsAg (-)、抗-HBs(+)。

下列哪项能证明该患者是HBV感染

A．HBsAg

B．抗-HBs

C．抗-HBe

D．HDAg

E．抗HD

Helen’s eyes are not very good, so she wears glasses. But she doesn’t wear glasses when she is with her friend, Jim. When Jim comes to her house to take her out, she will take her glasses off, and when she gets back, she puts on the glasses.

One day her mother asks her, “Helen, why don’t you wear glasses when you are with Jim? He takes you to many lovely places in his car, but you can’t see anything. ” Helen says, “I look more lovely to Jim when I’m not wearing my glasses and he looks better to me, too. ”

小题1:Jim comes to take Helen        .

A．to school

B．to work

C．to see lovely places

D．to his home小题2:Helen doesn’t wear glasses             .

A．when Jim is with her

B．when she is at home

C．when she is at school

D．in the evening小题3:Jim and Helen go out         .

A．by bus

B．by car

C．by bikes

D．by plane小题4:Which sentence is right?

A．Helen doesn’t like Jim.

B．Helen wants to look more lovely.

C．Jim doesn’t like glasses.

D．Helen’s mother knows Helen very much.小题5:Jim looks better to Helen           .

A．when he sees everything clearly清楚地.

B．when she sees everything clearly.

C．when he doesn’t see things clearly.

D．when she doesn’t see things clearly.

粮豆在储存过程中的主要卫生问题是泥土等夹杂物的污染。( )

化学分析中，消除干扰的主要方法是（）和（）。

HTML代码表示？（）

A．创建一个超链接

B．创建一个自动发送电子邮件的链接

C．创建一个位于文档内部的靶位

D．创建一个指向位于文档内部的链接