何为电瓶叉车载荷曲线?有何作用?
参考答案:
“载荷曲线”是叉车制造厂对叉车进行稳定性计算和安全载荷试验得出的科学依据,按照它进行操作,是防止叉车倾翻事故的最有效的方法。
《母婴保健法》规定的孕产期保健服务不包括()
A.母婴保健指导
B.孕妇、产妇保健
C.胎儿保健
D.胎儿性别诊断
E.新生儿保健
The network layer provides services to the transport layer.It can be based on either (71) .In both cases,its main job is (72) packets from the source to the destination. In network layer,subnets can easily become congested,increasing the delay and (73) . for packets.Network designers attempt to avoid congestion by proper design.Techniques include (74) policy,caching,flowcontrol,and more. The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service.The methods that can be used for this include buffering at the client,traffic shaping,resource (75) ,and admission control.Approaches that have been designed for good quality of service include integrated services(including RSVP) ,differentiated services, and MPLS.
A.dealing with B.routing C.sending D.receiving