主板集成了前置USB接线柱，一般为9根针一组，一组提供（）个前置USB接口。
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经许可使用他人注册商标的，（）在使用该注册商标的商品上标明被许可人的名称和商品产地。
A. 必须
B. 可以
C. 应该
D. 无需
Which statement best describes the differences between Cisco SMARTnet and Cisco SMARTnet Onsite？（）
A. CiscoSMARTNet Onsite includes all of the elements of Cisco SMARTnet with the additionalprovision of onsite technician to perform parts replacement
B. CiscoSMARTnet Onsite is primarily attractive to customers who do not need to replace theirhardware immediately， but would still like an onsite technician to install and replace hardware
CiscoSMARTnet Onsite includes certification classes and live network consulting at thecustomer site
D. CiscoSMARTnet Onsite provides network monitoring for small-to-medium sized businesses andprovides onsite technical resources when hardware problems are detecteD
儿童进行发明创造的推动力是知识与技能。
A. 正确
B. 错误
体节中胚层分化出生皮节、生骨节和生肌节。
A. 正确
B. 错误
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