"Scavenging" on a diesel engine means （）. ["injecting fuel oil into a cylinder","removing exhaust gases from the cylinder","forcing air into the cylinders under pressure after the exhaust valve has dosed","a combination of all the above"]
风险企业选择风险资本家的要素不包括（） ["风险投资机构的性质","风险资本家的业绩","退出变现计划","属于国内资本还是国际资本"]
申请成为交通银行网上支付业务特约商户的企业，经营行为和经营商品符合国家相关法规，商品质量好、销量大，具有良好的社会信誉和商业信誉，注册资本在（）（含）以上。 ["10万","50万","100万","500万"]
计算机病毒隐藏（潜伏）在（）。 ["外存","内存","CPU","I\/O设备"]
简述GSM-R手持台车次功能号注册、注销步骤。
什么是萎缩（atrophy）？
