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【判断题】
组合开关可直接启动5kw以下的电动机。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】Which two statements are true about the primary key constraint in a table？ （）
A.
It is not possible to disable the primary key constraint.
B.
It is possible to have more than one primary key constraint in a single table.
C.
The primary key constraint can be referred by only one foreign key constraint.
D.
The primary key constraint can be imposed by combining more than one column.
E.
The non-deferrable primary key constraint creates an unique index on the primary key column if it is not already indexed.
【多选题】Which two statements regarding asymmetric key encryption are true？（）
A.
The same key is used for encryption and decryption.
B.
It is commonly used to create digital certificate signatures.
C.
It uses two keys： one for encryption and a different key for decryption.
D.
An attacker can decrypt data if the attacker captures the key used for encryption
【多选题】Which of following are two key reasons for Nick's success? Click on two answers.
A.
Nike is the best brand of athletic footwear and sports clothing.
B.
The managers of Nike, Bowerman and Knight are both athletes.
C.
The company let Jordan endorse Nile's shoes.
D.
The diligence of the company managers.
【多选题】Which two statements about the Diffie-Hellman (DH) key exchange process are correct? （）(Choose two.)
A.
In the DH key exchange process, the session key is never passed across the network.
B.
In the DH key exchange process, the public and private keys are mathematically related using the DH algorithm.
C.
In the DH key exchange process, the session key is passed across the network to the peer for confirmation.
D.
In the DH key exchange process, the public and private keys are not mathematically related, ensuring higher security
【单选题】精准农业技术发展趋势是( )。
A.
无人化、智能化、网络化、标准化
B.
农机无人驾驶，智能化农机设备，农业物联网，标准化
C.
农业信息快速低成本实时采集，农业专家决策，智能化农机设备，农业物联网，标准化
D.
自动化、智能化、标准化
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