题目内容

《煤矿矿井机电设备完好标准》规定：同一部位的螺母、螺栓规格一致。平垫、弹簧垫圈的规格应与螺栓（）相符合。

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Construction of a new automobile parts manufacturing facility has recently been completed. Thefacility IT manager wants to deploy voice over WLAN. During your initial walkthrough， you observenumerous highly reflective surfaces on the manufacturing equipment and in the buildingconstruction itself. What potential problem exists that should be accounted for during your sitesurvey？（）

A. LOS modulation
B. Multipath distortion
C. RF signal absorption
D. RF signal attenuation
E. Fresnel zone impedance

聚合物的降解

车站客流量包括哪些？

空压机空载起动电空阀YV14，在空压机瞬间开放或延时（）后失电，关闭排风口，保证压缩机的正常起动。

A. 2s
B. 3s
C. 4s
D. 5