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【单选题】
当两个以上标签同时应答或者一个标签应答未完成,另一个标签开始应答,这种现象称为( )A.
标签碰撞
B.
天线碰撞
C.
ALOHA碰撞
D.
二碰撞
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反馈参考答案：
举一反三
【单选题】沼气发酵调节提高pH的方法不包括( )
A.
经常少量出料并投入同量新料
B.
加入草木灰和适量的氨水
C.
加入氢氧化钠
D.
用石灰水、碳酸钠溶液或碳酸氢钠溶液调节pH值
【单选题】以下几项中，在颁布时间上不属于20世纪80～90年代的是( )
A.
布什的教育政策
B.
《国家在危机中：教育改革势在必行》
C.
《国防教育法》
D.
《普及科学——美国2061计划》
【单选题】Wherever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them.
A.
vestiges
B.
residues
C.
characteristics
D.
figures
【单选题】When did the latest bomb explosion take place?
A.
It took place just one hour after two other bombings.
B.
It took place on Thursday.
C.
It took place on Tuesday when the train was entering a station.
D.
It took place on Tuesday when the train was leaving a station.
【简答题】The two roads meet________ a market lies. [A] at the place [B] where [C] there [D] at there
【单选题】The World Cup ________ two years after the Olympics. [ ]
A.
is taken place
B.
takes place
C.
held
D.
is holding
【单选题】Is this ________ we met each other two years ago
A.
place
B.
place in which
C.
where
D.
place which
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