皮皮学，免费搜题
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【判断题】
电子商务系统中使用的安全技术包括网络安全技术、加密技术、数字签名、密钥管理技术、认证技术、防火墙技术以及相关的一些安全协议标准等。（ ）A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】During virtual reality operations, the surgeon can have a better view of the cuts in the body because ________.
A.
he is looking at the cuts on a computer screen
B.
the cuts can be examined from different angles
C.
the cuts have been highly magnified
D.
he is wearing 3-D glasses
【单选题】A surgeon who has worked 40 hours in a row without sleep ______.
A.
can still provide quality medical care
B.
will remain alert because he is used to it
C.
may ignore the potential risk of insufficient sleep
D.
should be fired if he continues the medical operation
【单选题】We can infer from Mary's story that ______ .
A.
the surgeon offered someone else's medicine to Mary by mistake
B.
teenagers are vulnerable to drug abusing due to their curiosity
C.
the prescription drugs abusing will develop faster in the future
D.
parents play a positive role in preventing children's drug abusing
【单选题】During virtual reality operations, the surgeon can have a better' view of the cuts in the body because
A.
he is looking at the cuts on a computer screen
B.
the cuts can be examined from different angles
C.
the cuts have been highly magnified
D.
he is wearing 3-D glasses
【简答题】由于直流电弧比交流电弧更难以熄灭,故直流接触器多采用( )灭弧装置和( )灭弧罩。
【单选题】The article says that a surgeon can triumph when he ______.
A.
performs a successful operation
B.
triumphs over the body
C.
removes a cancer
D.
cuts out that which is life-destroying
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