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If a person gets something in his or her eye and you see that it is not embedded,you can ().
雷达反射率η是单位体积中,所有降水粒子的()。
头槽绦虫寄生的部位是( )。
某预应力混凝土屋架为强度C50,下弦杆孔道长度30m,采用钢绞线预应力钢筋,配有5束ΦP15.2钢绞线,每束截面积139mm 2,采用的张拉的程序为0→Pj,张拉控制应力σ con=0.70f pyk (f pyk=1860N/mm 2),Es为1.93Ⅹ10 5Mpa。张拉时要求混凝土达到设计强度80%,试问同条件养护混凝土试块强度应达到多少才可以张拉?5束钢绞线同时张拉,计算张拉钢筋时最大张拉力和钢筋理论伸长值。
热处理是改善钢()的重要途径,也是改善材料()的重要途径。
视交叉与垂体的毗邻关系的正常位是()
下列哪一项舒张期正向血流速度最大()。
放大摄影原理的主要依据是( )
丙二醇()
导游人员带团的理念是( )。
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There are()rats on board.
There are()rats on board.
The pilot is on board,() ?
Which department do you work in on board?()
The electronic engineer has come on board to ()you.
We()our breakfast when the pilot came on board.