题目内容

大体积混凝土的浇筑温度不宜超过( )。

A. 20℃
B. 24℃
C. 28℃
D. 32℃

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下列混凝土中养护时间不得低于14d的是( )。

A. 矿渣水泥拌制的混凝土
B. 有抗渗要求的混凝土
C. 环境水对混凝土有侵蚀作用时
D. 掺有速凝剂的混凝土

Not all fast-food chains are like McDonalds, KFC and Burger king.Fast food chains are not all _1__ .

There are as many food choices in America as there are 1 in the _2____.

Cereal, smoothies, milk and toast or a cup of coffee are all examples of __1 in America.Most Americans eat _2_ on the go. This could be sandwiches, leftovers or a salad.For _3___, it could be any combination of vegetables, meat and sauce, paired with either bread, rice or pasta.