从定义及特性可以看出，区块链是一种保密性强、不可篡改、（）的技术。

A.电商
B.外卖
C.快递
D.移动支付

A. Operator
B. Delivery
C. Delivery
D. Mobile payments

A.InT
B.IoT
C.SoT
D.InU

A.输入设备
B.用户界面
C.输出设备
D.运动反馈

A. Input device
B. User interface
C. Output device
D. Movement feedback

A.较低的电磁辐射
B.较低的通信距离
C.较低的网络延迟
D.较低的穿墙能力

A. Lower electromagnetic radiation
B. Lower communication distance
C. Lower network delay
D. Lower wall-piercing capability

A.模拟
B.数字
C.电磁波
D.微波

A. Simulation
B. Digital
C. Electromagnetic Wave
D. Microwave

A.初级应用阶段
B.中级应用阶段
C.高级应用阶段
D.普及应用阶段

A. Initial application phase
B. Intermediate application phase
C. Advanced application phase
D. Universal application phase

A.人工智能
B.新能源汽车
C.导航系统
D.移动支付

A. Artificial intelligence
B. New energy vehicles
C. Navigation systems
D. Mobile payments

A.2006
B.2007
C.2005
D.2008