强制力是生产者要求中间商履行双方合同而执行某些职能的权力。 ()
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Which of the following is CORRECT about the author's trip to Britain？
A. She met many artists and craftsmen on her way to Britain.
B. She spent a whole summer in Britain making crafts.
C. She was asked to sew clothes, pants and curtains and made a fortune.
D. Many people were found to be interested in making things themselves.
According to the author, which of the following is NOT an achievement of the 20th century
A. Nuclear power.
B. Strong computers.
C. Nuclear weapons.
D. Conquering cancer.
下列各项中,不属于商业信用的是()。
A. 应付票据
B. 应付工资
C. 预收账款
D. 应付账款
攻击者向某个设备发送数据包，并将数据包的源IP地址和目的IP地址都设置成攻击目标的地址。这种攻击被称为______。
A. SYN Flooding攻击
B. DDOS攻击
C. Ping of Death攻击
D. Land攻击
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