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【单选题】
Undocumented workers became the target of “Operation Safe Travel” because ________.A.
evidence was found that they were potential terrorists
B.
most of them worked at airports under threat of terrorists
C.
terrorists might take advantage of their illegal status
D.
they were reportedly helping hide terrorists around the airport
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【单选题】Is _____ necessay to complete the design before National Day?
A.
this
B.
he
C.
that
D.
it
【简答题】发电厂按其所利用的能源不同,主要分为: ( )、 ( )和 ( )。
【简答题】It is necessay to use _____ S-shaped tube here.
【简答题】是构成计算机系统的物质基础、而 是计算机系统的灵魂、二者相辅相成、缺一不可
【简答题】发电厂按其所利用的能源不同,主要分为____、____、____、。
【简答题】发电厂按其所利用能源不同,可分为 , , 。
【单选题】一个4位R-2R倒T型电阻D/A转换器,当输入数字量为0010时,对应的输出模拟电压为0.04V,当数字量为1101时输出电压为【 】。
A.
0.13V
B.
0.48V
C.
0.26V
D.
0.52V
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