四缸四行程汽油机在压缩行程中，可燃混合气的压力约为（） 800～1300KPa。 800～1400KPa。 1000～1400KPa。 1100～1400KPa。
Which three statements about end-to-end delay are true？（） End-to-end delay is the sum of propagation delays，processing delays，serialization delays，and queuing delays.。 Coast-to-coast end-to-end delay over an optical link is about 20 ms.。 Processing delay depends on various factors，which include CPU speed，CPU utilization，IP switching mode， and router architecture.。 Propagation and serialization delays are related to the media.。 Propagation delay is the time it takes to transmit a packet and is measured in bits-per-second （bps）.。 Serialization delay is the time it takes for a router to take the packet from an input interface and put it into the output queue of the output interface.。
同一基因型不因环境条件改变而产生不同表型。
Identify the differences of option 10A， as opposed to option 10C， for interAS vpn offerings. For option 10A（）. Greater scalability is offered。 The ASBR holds VPNv4 routes。 Relative technical simplicity is offered。 Lower relative security is offered。 Multihop E-BGP between ASBRs is utilized。 Better suitability for InterProvider VPNs is provided。
有氧耐力运动对大众健身特别有益，要提高健身效果，必须保证（） 心率大约140~170次／分，持续时间40~60分钟，每周锻炼频率3~4次。 心率大约120~160次／分，持续时间30~50分钟，每周锻炼频率2~3次。 心率大约140~170次／分，持续时间40~60分钟，每周锻炼频率2~3次。 心率大约120~160次／分，持续时间40~60分钟，每周锻炼频率3~4次。
江南私家园林的装饰利用的是（）装饰
