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【单选题】
The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?A.
Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive
B.
Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link
C.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
D.
Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex ethernet uses a jam signal
E.
None of the above
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【单选题】在过去的国际贸易中，Y国的疯牛肉、M国的婴儿奶粉、R国的鱼肉罐头等都出现过食品安全问题，都给贸易国造成不同程度的损失，可见一国食品安全问题会殃及他国食品安全。从哲学上看表明C①事物之间是相互影响、相互制约的②事物处于因果联系的链条之中③外因是事物发展变化的根据④国际贸易的矛盾是不可调和的（）
A.
①②③
B.
②③④
C.
①②
D.
①④
【单选题】下列有关食品安全风险评估的说法中，错误的有哪一项?( )
A.
通过食品安全风险监测或者接到举报发现食品可能存在安全隐患的，应当立即组织进行检验和食品安全风险评估
B.
国务院卫生行政部门应当及时向社会通报食品安全风险评估的结果
C.
食品安全风险评估结果得出食品不安全结论的，有关部门应立即采取相应措施，确保该食品停止生产经营，并告知消费者停止食用
D.
对经综合分析表明可能具有较高程度安全风险的食品，国务院卫生行政部门应当及时提出食品安全风险警示，并予以公布
【简答题】A boy called Mario had many friends, and he was proud of it. Whoever he met, he would like to show off(炫耀) how popular he was at school. One day, his grandpa said to him, “Mario, I know that you don’t...
【单选题】______ girls took part in the Super Voice competition, but only a few of them succeeded. [ ]
A.
One million of
B.
Thousands and millions
C.
Millions of
D.
Two millions
【简答题】梯形是平面图形吗?为什么?
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