题目内容
（请给出正确答案）
[单选题]
AWS IoT Core的功能包括以下哪些内容？
A.将设备连接至云和其他设备
B.在所有连接点提供身份验证和端到端加密服务
C.按照业务规则快速筛选和转换设备数据
D.存储互联设备的最新状态
提问人：网友oyq8888
发布时间：2022-01-07
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B.内存管理
C.SQL查询
D.容错机制
题目内容
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更多“AWS IoT Core的功能包括以下哪些内容？”相关的问题
第3题
请根据短文内容，回答题。
Japanese Drilling into Core of Earth
In what resembles a journey to the center of the Earth, Japanese scientists have launched the world&39;s first attempt to bore a hole into the red-hot core of a volcano and unlock the secrets of deadly eruption.
A 50-meter-high oil-rig-like derrick perched on the scrubby slopes of Japan&39;s Mount Unzen will begin drilling through the volcano&39;s crust next week in a bid to sample the magma bubbling below.
The aim is to study how the liquefied rock causes menacing gas buildup, said team leader Setsuya Nakata, of the University of Tokyo&39;s Earthquake Research Institute.
"Gassing is important because it controls the explosivity of eruptions," Nakata said. "The results can be expanded to anti-disaster research."
Mount Unzen, a wind-swept 1,486-meter dome on the southem island of Kyushu, is a perfect model. It erupted in 1991, showering avalanches of hot rocks over a nearby town, killing 43 people and leaving nearly 2,300 homeless. Another 11,000 people were evacuated from the area until 1995,when the volcano had stabilized.
The results are particularly important to a nation like Japan, where the meteorological agency monitors 20 dangerous peaks. Perhaps Japan&39;s most famous volcano is snowcapped Mount Fuji,which last erupted in 1707 and sprinkled Tokyo with ash.
The drilling on Mount Unzen will begin very soon from an altitude of 850 meters on its northwest slope. Scientists hope to tap a magma vent around sea level by August and extract a 200-meter-long core sample by summer 2004.
Boring into the glowing magma at that level would normally be impossible, because of its fiery 700 degree Celsius heat. Thus, slurry of water will be pumped into the drill shaft to cool the magma and allow the drill head to cut through.
Nakata said there is no danger of triggering another eruption.
According to the passage， Mount Unzen __________. 查看材料
A.erupted in 1707
B.eruptedin 1991
C.eruptedin 1995
D.erupted several times in the last century
第10题
AliOS Things重新设计和开发uMesh的原因有哪些？
A、目前只支持802.15.4作为MAC和PHY层协议
B、目前各种协议主要针对某一特定业务场景
C、目前没有支持多种不同通信芯片模块
D、需要加入对移动节点的支持
