问题 单项选择题

减水剂对混凝土的作用效果是()。

A.在减少用水量条件下,提高混凝土流动性

B.在用水量不变条件下,提高混凝土流动性

C.在流动性及水泥用量不变的条件下,提高混凝土强度

D.提高混凝土流动性的同时也提高混凝土强度

答案

参考答案:B

解析:

减水剂对混凝土的作用效果之一:在混凝土原配合比不变的情况下,提高混凝土流动性且不影响混凝土的强度。

改错题

短文改错

       此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行下边横线上画一个勾( √) ;如有错误( 每行只有一个错误) ,则按下列情况改正:

         此行多一个词:把多余的词用斜线(\) 划掉,在该行下边横线上写出该词,并也用斜线划掉。

         此行缺一个词:在缺词处加一个漏字符号( ∧) ,在该行下边横线上写出该加的词。

         此行错一个词:在错的词下划一横线,在该行下边横线上写出改正后的词。

         注意:原行没有错的不要改。

    

     When passing the bus station in the way home,                                  1.________

I found a little girl alone crying. Obviously, she lost,                                 2.________

looking for her mother. I went up and asked her why.

When asking where her mother was, she shook her head,                      3.________

but kept crying. Then I took her to the                                                   4.________

station office for a help. "Anyone who's lost a child, please come            5.________

to our broadcasting room…" was soon hearing again and again.             6.________

Minutes later, a worrying mother came. The girl ran to her                      7.________

happily, tear still in her eyes. The mother                                                8. ________

was thankful and asked for my name. With a smile,                                9.________

I answered, "I'm a League member. I have just done

that a League member should do. It's my duty."                                     10.________

单项选择题