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【多选题】
我国的国防手段包括A.
政治手段
B.
经济手段
C.
军事手段
D.
外交手段
手机使用
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反馈参考答案：
举一反三
【单选题】The earth is much cooler than the sun, and the wave length of the earth's radiations is much longer than that of sunrays. These longer heat waves cannot pass through the atmosphere as easily as the sh...
A.
heat waves rising from the earth
B.
waves absorbed by water vapor
C.
waves sent out by radio stations that transmit local programs
D.
the rays sent out from the sun
【多选题】Servlet 用于保持会话的技术有:( )。
A.
Cookie
B.
TCP/IP 三次握手
C.
HTTP session
D.
安全的HTTP协议HTTPS
E.
HTML 隐藏表单域
【简答题】accomplish
【单选题】Microwave communication uses high-frequency(56)waves that travel in straightlines through the air. Because the waves cannot(57)with the curvature of the earth, they can be(58)only over short distance....
A.
optical
B.
radio
C.
electrical
D.
magnetic
【单选题】How could 'levels of electromagnetic radiation that exceed international safety standards' be produced?
A.
Mobile phones give off a lot of electromagnetic radiation.
B.
Train carriages, buses, and lifts are not safe places to use mobile phones.
C.
A lot of people could use their mobile phones in a confined space at the same time.
D.
Blathering produces radio waves which bounce around the interior of these places.
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