The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion. ["flange","flash","plate","sheet"]
直放站和塔顶放大器中，（）属于双向放大器。
日本花道艺术兴起于日本的（）。 ["室町时代","江户时代","镰仓时代","桃山时代"]
风险投资企业的生命周期一般可以分为（）阶段。 ["种子期","起步期","成长期","成熟期"]
简述大陆张裂的单剪模式
工程中GSM系统同频干扰C/I要求大于（）dB，邻频干扰要大于（）dB。
