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【单选题】
在大多数的防火墙中的包过滤器是在包的基础上进行网络流量的处理。它们只工作在OSI参考模型()的哪一层。A.
物理层
B.
数据链路层
C.
网络层
D.
传输层
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【简答题】II. Classic reading(中华诗词诵读)
【单选题】The Natural Approach believes that the teaching of ______ should be delayed until comprehension skills are established.
A.
listening
B.
speaking
C.
reading
D.
writing
【多选题】用图解法设计如图所示的铰链四杆机构。已知其摇杆CD的长度lCD=75 mm，行程速度变化系数K=1.5，机架AD的长度lAD=100 mm，又知摇杆的一个极限位置与机架间的夹角φ=45°,求其曲柄的长度lAB和连杆的长度lBC（ ）【图片】
A.
l AB = 49 mm, l BC =120 mm
B.
l AB = 59 mm, l BC =1 2 0 mm
C.
l AB = 21 mm, l BC = 5 0 mm
D.
l AB = 21 mm, l BC = 60 mm
【简答题】II. Text Understanding 超星APP I. Fast Reading----Multiple Choice
【简答题】How to Be Effective Readers I. Introduction of reading and how to be effective readers A. Introduction of reading i. A method of absorbing 1.______ a. Comprehension b . Reading speed ii. Factors influ...
【单选题】II. Choose the correct answers after reading the passage. 1. What did the group do first in the morning? They .
A.
went into the forest slowly
B.
left the chimp family sleeping in a tree
C.
observed the family of chimps wake up
D.
helped people understand the behaviour the chimps
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