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C1=C2=1.2m，α1x=α1y=0.3m，h0=0.9m，ft=1.5MPa时，同柱冲切承载力与______项值接近。
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某单层单跨排架及支撑如图所示，柱顶与横梁铰接，柱底与基础刚接，柱高6000mm，采用 HN500×200×10×16，A=11420mm2，Ix=4.78×108mm4，ix=205mm，钢材牌号Q235-B，在排架侧边有一支撑柱，承受排架柱顶水平力，起排架的支撑作用，不承受其他荷载，支撑柱截面从可供货规格中选取，见下表。如此排架按强支撑考虑，其支撑柱截面应为______；按弱支撑考虑，其支撑柱截面应为 ______。此时，排架柱按稳定性计算的承载力N分别为______kN、______kN。
A．She's taking a bus.B．She's walking on a street.C．She's on a plane.D．She's taking a ta
如图所示的承重墙梁，各部分尺寸见下表，托梁混凝土强度等级为 C20，纵向受力钢筋采用HBB335，砖强度为MU10，水泥砂浆强度等级采用M5，荷载设计值Q1=23.8kN/m，Q2=116kN/m。
已知墙梁的计算跨度l0=6.05m，墙体计算高度hw=2.85m，则该构件可以按墙梁计算的洞口高度hh和宽度bh的限制值最接近下列______项数值。
The making of glass is a very old industry—at least 4,500 years old. Glass has many extraordinary qualities and it is often being used in new ways.
One of the most interesting new uses for glass is in telephone communication. Scientists have developed glass fibres as thin as human hair which are designed to carry light signals. When the light reaches the other end, it is first changed into electrical signals which are in turn changed into sound messages.
Called lightwave communication, the new system was used successfully in an experiment in Chicago in 1977. During the experiment, two glass fibres were able to carry 672 conversations at the same time. The lightwave cable, containing 144 glass fibres, is able to carry 50,000 conversations at the same time.
The lightwave communication system has two important advantages. First, the glass fibre cables are smaller and weigh less than copper cables. Second, they cost less.
Perhaps it can be said that telephone communication has entered the age of light.
According to the passage, people started to make glass ______.
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