【单选题】
受压构件的长细比不宜过大，一般应控制在l0/h≤25，l0/h≤3（h为矩形截面长边尺寸，b为矩形截面短边尺寸），其目的在于（)
①
防止受拉区混凝土产生水平裂缝
②
防止发生斜截面受剪破坏
③
防止影响其稳定性或使其承载力降低过多
④
防止正截面受压破坏
【单选题】
管路布置图中采用 绘出设备布置图， 绘制管道图形， 画出管件、阀门、支架等。1.粗实线 2.细实线 3.点画线 4.中实线
①
1,2,1
②
1,3,2
③
2,1,2
④
3,4,2
【单选题】
化工制图中以下哪种铅笔用于加粗描深图线？
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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H
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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HB
③
Normal
0
7.8 磅
0
2
false
false
false
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X-NONE
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{mso-style-name:普通表格;
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mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
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font-size:10.5pt;
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mso-font-kerning:1.0pt;}
2H
④
Normal
0
7.8 磅
0
2
false
false
false
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ZH-CN
X-NONE
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2B
【单选题】
α1和α2分别为A、B在两个恒容容器中平衡体系A(g) 2B(g)和2A(g) B(g)的转化率，在温度不变的情况下，均增加A的物质的量，下列判断正确的是
①
α1、α2均减小
②
α1、α2均增大
③
α1减小，α2增大
④
α1增大，α2减小