下列病毒中（）计算机病毒不是蠕虫病毒。 ["冲击波","震荡波","CIH","尼姆达"]
炭化室内始终保持正压是防止炉门冒烟的有效措施。
Before sailing for a foreign port，what document must you get（）. ["The Policy of insurance","The Report of Entrance","The Clearance","The Pratique"]
影响创业企业的业绩最重要的因素是（） ["融资规模","行业生命周期","管理水平","技术水平"]
产品的无形要素包括（） ["购买信贷","免费送货","产品价格","交货期","保证条件"]
基于通信的列车控制（CBTC）有哪些优越性？
