光交换技术有哪些优点（）。 ["大容量、数据率和格式的透明性、可配置性等特点，支持未来不同类型数据","能提供端到端的光通道或者无连接的传输","带宽利用效率高，能提供各种服务，满足客户的需求","把大量的交换业务转移到光域，交换容量与wdm传输容量匹配，同时光交换技术与OXC、MPLS等新技术的结合，实现网络的优化与资源的合理利用"]
When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（） ["starting air pressure","scavenge air pressure","over-speed trip","banjo oiler line"]
下列哪种变化发生在中生代的有机界中？（） ["被子植物的发展和传播","爬行类的发展和传播","鱼类的发展和传播","绿藻的发展和传播"]
The speed of the turbocharger for a four-stroke/cycle diesel engine driving a generator at constant speed depends on the （） ["engine speed","kilowatt load","fuel injection pressure","air intake manifold temperature"]
轴封加热器属于（）换热器。 ["表面式","混合式","蓄热式"]
第四代计算机采用（）为主要逻辑部件。
