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【单选题】
图中小球受到的重力在x轴上的投影为( )。A.
0
B.
G
C.
-G
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反馈参考答案：
举一反三
【单选题】需要执业药师向患者作特别提示的是
A.
当患者购买贵重药品时
B.
当患者购买非处方药时
C.
当患者购买近期调价的药品时
D.
当患者购买需特殊贮存的药品时
E.
当患者购买有效期内的药品时
【多选题】What are two benefits of control plane policing？（）
A.
protection against denial of service （DoS） attacks at infrastructure routers and switches
B.
protection against known worm attacks in routers and switches
C.
quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switches
D.
quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switches
E.
quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switches
【简答题】名词概念:电器 低压电器 2、常见刀开关的作用和符号? 3 、低压断路器的作用是什么?具有哪些保护功能?画出电路符号。
【简答题】低压断路器具有( )、 过电流、( )、断相、( )、欠电压 等保护作用。
【单选题】听力原文：W: Okay, Mr. Taylor, let's go ahead and begin. First of all, tell me about your last job. M: Well, as stated on my resume, I worked at Hi Tech Computers for five years. W: Okay. Hi Tech. And what...
A.
He works very hard for his last company.
B.
He was in contact with computers every night.
C.
He has much experience in the networks.
D.
He has been fired by his last company.
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