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【单选题】
液压控制阀一般分为( )。A.
方向控制阀、压力控制阀
B.
方向控制阀、流量控制阀
C.
A和B
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举一反三
【多选题】玻璃作为一种非晶态无机材料具有哪些特性?
A.
抗拉强度低,抗压强度大较大
B.
硬度高,耐磨性好
C.
高度透明,可进行着色
D.
常温下为不良导体,熔融状态变为良导
E.
不能承受温度急剧变化
F.
能抵抗氢氟酸以外的大多数酸种腐蚀,耐碱腐蚀较差
G.
无毒无害,属“绿色”环保材料
【单选题】下列有关水玻璃的性质说法有误的一项是()
A.
水玻璃硬化后具有较高的粘结强度、抗拉强度和抗压强度
B.
硬化后的水玻璃，其主要成分为SiO2，所以它的耐碱性能很高
C.
水玻璃硬化形成SiO2空间网状骨架，因此具有良好的耐热性能
D.
以镁质耐火材料为骨料配制水玻璃混凝土,其使用温度可达1100℃
【单选题】Which of the following is not a software engineering code of ethics?
A.
Software engineers shall be fair to and supportive of their colleagues.
B.
Software engineers shall participate in lifelong learning regarding the practice of their profession and shall promote an ethical approach to the practice of the profession.
C.
Software engineers shall advance the integrity and reputation of the profession consistent with the public interest.
D.
Software engineers shall maintain dependence in their professional judgment.
【简答题】车削细长轴时，要使用中心架和跟刀架来增加工件的（）
【单选题】在拍卖中，拍卖师应对参与竞买者表现出高度的职业精神与尊重。可翻译为（ ）．
A.
In conducting an auction ，the auctioneer must deal with customers in a manner exhibiting the highest standards of professionalism and respect。
B.
An auctioneer must maintain absolute fidelity to client and the client''s interests。
C.
An auctioneer is duty bound at all times to abide by the laws and regulations governing his profession in all jurisdiction in which he conducts his practice。
D.
The auctioneers shall not bid for the lots auctioned by Themselves。
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