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【单选题】
下列有接收机灵敏度的表述不正确的是 ()。
A.
光接收机灵敏度描述了最低接收平均光功率
B.
光接收机灵敏度描述了光接收机的最高误码率
C.
光接收机灵敏度描述了每个光脉冲中最低接收光子能量
D.
光接收机灵敏度描述了每个光脉冲中最低接收平均光子数
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参考答案:
举一反三
【单选题】When the Group of Seven was founded in 1920, the artists hoped for recognition of their works and ideas. In the catalog to their first exhibition, they actually invited adverse criticism -- only becau...
A.
The origin of Canadian traditions,
B.
The seven symbols of Canada.
C.
Popular trends in Canadian art.
D.
A group of seven Canadian artists.
【简答题】将十二生肖中文名称与其英文词汇匹配
【简答题】The Free-Wheeling Family: Car-Free in Suburbia Our family has always been a one-car family. Late last year, we went further by deciding to give up the only car our family of 4 owned in preparation for...
【单选题】The author implies that the Group of Seven welcomed adverse criticism because it would ______ .
A.
help them to improve as artists
B.
mean that their work was being noticed
C.
increase the market value of their work
D.
gain support for them as victims of unfair criticism
【简答题】试说明地下水资源量评价应遵循的原则。
【单选题】直接由胚根生长而来,有固定生长部位的是()
A.
主根
B.
侧根
C.
定根
D.
不定根
【单选题】由胚根生长而来,有固定生长部位的根称
A.
主根
B.
侧根
C.
定根
D.
不定根
E.
气生根
【简答题】Match the English words with their Chinese meanings. 将中英文词汇匹配
【判断题】The Free-Wheeling Family: Car-Free in Suburbia 1 Our family has always been a one-car family. Late last year, we went further by deciding to give up the only car our family of 4 owned in preparation f...
A.
正确
B.
错误
【单选题】The Group of Seven, a clique of Canadian artists painting at the turn of the century, has been credited with arousing a widespread awareness of Canada’s rugged landscape.
A.
stimulating
B.
prolonging
C.
glorifying
D.
encouraging
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