[单选题]CDA的压空正确的确认流程是( ). (1 分)
A.拔下气管电磁阀手动操作
B.电磁阀手动操作
C.拔下气管电磁阀手动操作确认后再接回气管
D.以上说法都是错误的

Internet, computer-based global information system. The Internet is composed of many interconnected computer networks. Each network may link tens, hundreds, or even thousands of computers, enabling them to share information with one another and to share computational resources such as powerful supercomputers and databases of information. The Internet has made it possible for people all over the world to communicate with one another effectively and inexpensively.
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The Internet has brought new opportunities to government, business, and education. Governments use the Internet for internal communication, distribution of information, and automated tax processing. In addition to offering goods and services online to customers, businesses use the Internet to interact with other businesses.
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Use of the Internet has grown tremendously since its inception. The Internet’s success arises from its flexibility. Instead