【单选题】【消耗次数：1】
普通混凝土的组成材料中，砂的选择主要依据错误的是（）
①
A颗粒级配和粗细程度
②
B砂中含泥量及泥块含量
③
C砂的强度
④
D有害物质含量
参考答案：
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相关题目
【单选题】
下列关于含泥量、泥块含量和石粉含量说法有误的一项是（ ）。
①
含泥量是指砂中粒径小于75um的岩屑、淤泥和黏土颗粒的含量
②
含泥量或泥块含量超量时，不得采用水洗的方法处理
③
合适的石粉含量可以提高混凝土的密实性
④
泥块含量必须严格控制
【单选题】
下列关于砂中有害物质的说法有误的一项是（ ）。
①
云母会影响混凝土的工作性和强度
②
硫化物可以降低混凝土的耐久性
③
有机物可以加速水泥的凝结
④
氯盐会对钢筋造成锈蚀
随机题目
【单选题】
某管道的标注为VE0402—φ35×3.5B，请问VE是指 、04是指 、02是指 、B是指 。1、物料代号 2、 主项号 3、 管道材料代号 4、 工段号
①
1,2,4,3
②
1,3,4,2
③
2,3,4,1
④
3,4,2,1
【判断题】
mso-ascii-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:
宋体;mso-bidi-font-family:Times New Romanmso-bidi-theme-font:minor-bidi;
mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">通过对组合体尺寸的分析，把组合体三视图尺寸分为定形尺寸、定位尺寸和总体尺寸
①
正确
②
错误
【判断题】
mso-bidi-font-family:Times New Romanmso-bidi-theme-font:minor-bidi;
background:white;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:
AR-SA">零件图视图数量及表达方法应根据零件的具体结构特点和复杂程度而定，表达的原则是：完整、简洁、清晰
①
正确
②
错误
【判断题】
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color:#333333;background:white;mso-ansi-language:EN-US;mso-fareast-language:
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①
正确
②
错误
【单选题】
正投影法中，投影面、观察者、物体三者相对位置是( )
①
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人——面——物
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C. 人——物——面
④
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面——人——物
【单选题】
当直线、平面与投影面平行时，该投影面上的投影具有( )
①
Normal
0
7.8 磅
0
2
false
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EN-US
ZH-CN
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积聚性
②
Normal
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真实性
③
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类似收缩性
④
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收缩性
【单选题】
mso-bidi-font-family:宋体;mso-font-kerning:0pt;mso-ansi-language:EN-US;
mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-bidi-font-weight:bold">平行剖切面剖视图所用的剖切平面是
①
一个剖切平面
②
两个相交的剖切平面
③
两个剖切平面
④
几个平行的剖切平面