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【单选题】
下列代谢,能力获得最有效的方式是()。A.
发酵
B.
有氧呼吸
C.
无氧呼吸
D.
化能自养
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】2007采用100BASE—T物理层媒体规范,其数据速率及每段长度分别为
A.
100Mbps,200m
B.
100Mbps,100m
C.
200Mbps,200m
D.
200Mbps,lOOm
【单选题】— So how long have you been in Beijing? — Just a couple of days. I’m on a great tour, you know, and I ______ all the places of interest here.
A.
visited
B.
am visiting
C.
have visited
D.
have been visiting
【单选题】-How long have you been in the room? - Just a few minutes. My cousins ___home together with me.
A.
have walked
B.
had walked
C.
walked
D.
have been walking
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