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【单选题】
以下说法正确的是A.
IEEE802标准不仅定义了局域网的标准,还定义了广域网的标准
B.
IEEE802.5定义的是有关令牌总线网的相关标准
C.
IEEE802.3定义了令牌环网的相关标准
D.
IEEE802.3是基于著名的以太网规范,定义了CSMA/CD和物理层规范
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举一反三
【单选题】According to the passage, Americans tend to ignore the rest of the world because ______.
A.
they are too proud of themselves
B.
they are not interested in other countries
C.
they are too busy to learn about other countries
D.
their country does not have many neighboring nations
【单选题】According to the passage, Americans tend to ignore the rest of the world because______.
A.
they are not interested in other countries
B.
they are too proud of themselves
C.
their country does not have many neighboring nations
D.
they are too busy to learn about other countries
【简答题】44 在相同条件下丈量两段距离, S 1 =100m , S 2 =900m ,设对 S 1 丈量 3 次平均值的权 P s1 =2 ,求对 S 2 丈量 5 次平均值的权 P s2 。
【单选题】Why Americans travel overseas less than their western counterparts?
A.
Their vacations tend to be shorter.
B.
They can't afford international tours.
C.
They are more interested in making money.
D.
They prefer staying where Americans are in the majority.
【单选题】病人蔡晶,女,58岁,患食道癌,手术后第三天,为预防呼吸道感染,最佳的护理措施是
A.
病室经常开窗通风
B.
使用空气清新剂
C.
给予呼吸道隔离
D.
紫外线空气消毒
E.
超声波雾化吸入疗法
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