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Directions: Filling in the blanks with the proper prepositions. 1) Failing to lock your doors at night is an invitation ___ disaster. 2) I was grateful ____ the stranger for returning my lost wallet. 3) The audience cheered, yelled and whistled ___ approval. 4) The chickens pecked ___ the seeds which covered the ground. 5) __ the end, I decided that I wouldn't go after all. 6) We sent ____ the holiday brochure as soon as we saw it advertised. 7) As an actor, he has to be able to cry ___ will. 8) She was condemned ____ death on May 12th and executed two weeks later. 9) Before handing over to John, I'd like to thank you all ____ your support. 10) Bill greeted us _____ a cheerful smile. 11) Please put the lights ____ as you leave the building. 12) Don't blame me - I did it ___ my boss's request. 13) Don't go to work ____ an empty stomach. 14) You shouldn't drive for more than three hours _______ taking a break.
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【简答题】为什么说碱性耐火材料中的酸性氧化物及酸性耐火材料中的碱性氧化物均被视为有害杂质?
【判断题】When the sales order system is on-line, salespersons can immediately verify the inventory levels.
A.
正确
B.
错误
【判断题】[判断题] ( )在每两个相连的感光度号数之间,差异的感光能力是两倍。
A.
正确
B.
错误
【单选题】测定和了解耐火材料的高温使用性质,对提高产品()和合理选用耐火材料都有直接意义。
A.
热震稳定性
B.
质量
C.
高温使用
【多选题】下列特性中,属于致密性耐火材料特性的有( )。
A.
质量较轻
B.
气孔率低
C.
耐磨性好
D.
体积密度低
E.
耐火度高
【简答题】耐火材料的物理性质有哪些?
【简答题】III.Translate the following short paragraphs into Chinese. 1.When the purchase order of the buyer and the sales order of the seller agree, the orders become a contract between the buyer and the seller...
【简答题】门专管对寄存器装入数据的控制, 门专管对寄存器输出数 据的控制。
【简答题】测定和了解耐火材料的高温使用性质,对提高产品()和合理选用耐火材料都有直接意义。
【判断题】在每两个相连的感光度号数之间,差异的感光能力是两倍。
A.
正确
B.
错误
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