问题 问答题

什么是水乳型SBS改性沥青防水涂料

答案

参考答案:水乳型SBS改性沥青防水涂料是以石油沥青为基料,添加SBS热塑性弹性体高分子材料及乳化剂、分散剂等制成的水乳型改性沥青防水涂料。其特点如下:
1)具有优良的低温柔性和抗裂性能,是目前改性沥青涂料中性能较好的一个品种;
2)对水泥、混凝土、木板、塑料、油毡、铁板、玻璃等各种材质的基层均有良好的粘结力;
3)冷施工、无嗅、无毒、不燃,施工安全简单;
4)耐候性好,夏天不流淌,冬天不龟裂,不变脆。

阅读理解

Betty and I are best friends. Our birthdays are on the same day, so every year we have a birthday party together. But this year we had a costume party instead.

While we were writing the invitations, my mom came in and asked, “Nancy, what about inviting John?” John had been in our class for only a few months, but he was already getting better grades in math than anyone else in our class. “Mom, he wears the same pants to school every day. How could he even afford a costume?” Mom said nothing.

The next day, mom gave me an envelope(信封) with a shopping card in it. “I thought it would be nice for you to give this to John.” Mom said. But how? We didn’t want to make John embarrassed. We discussed it for a long time. Finally, Betty and I had a good idea.

On the day of our party, John arrived, in an old sheet(床单),but still in the same brown pants as usual. Before eating the birthday cake, Betty said in a loud voice, “Now it’s time for the great prize game.” It was a math game. None of us were surprised when John gave the right answer first and walked off with the envelope.

Everything went well as we planned. John wore a new pair of pants and a new shirt the next week. He felt happy. So did we.

小题1: Nancy and Betty are ______.

A.best friends

B.cousins

C.sisters

D.brother and sister小题2: John did best in ______ of all the class.

A.English

B.games

C.math

D.science小题3: ______ had the idea of playing a math game.

A.Nancy’s mother

B.Nancy

C.Betty

D.Betty and Nancy小题4:John got ______ as the prize for the math game.

A.an envelope

B.a shopping card

C.a birthday cake

D.a new pair of pants小题5: Betty, Nancy and John all felt ______ in the end.

A.happy

B.embarrassed

C.surprised

D.sad

判断题