SCS/AS can send data to LwM2M device using Nidd Downlink Data transfer request. When the Downlink data transfer request is sent LwM2M server will send corresponding LwM2M message to the device. If the device is not registered with the server then HTTP 404 message should be returned. Figure ...
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短周期元素A、B、C、D最高价氧化物对应水化物分别为W、X、Y、Z,A是短周期中原子半径最大的元素,常温下W、Y、Z均可与X反应,A、C、D的原子序数及0.1 mol/LW、Y、Z溶液的pH如图所示。下列说法正确的是 A.B的离子半径大于A的离子半径 B.C氢化物稳定性大于D氢化物稳定性 ...