皮皮学，免费搜题
登录
搜题
【判断题】
确定接收机性能的一个重要参数是接收机灵敏度，它通常定义为在接收机BER≥10 -9 的条件下，所要求的最小平均接收光功率。(    )
A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
the first song of the month
B.
the first corn of the harvest
C.
the first dance of the night
D.
the first fruits of the harvest
查看完整题目与答案
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
unity
B.
faith
C.
creativity
D.
responsibility
查看完整题目与答案
【简答题】三菱PLC的输入接线端子用文字符号 表示,输出接线端子用文字符号 表示。
查看完整题目与答案
【单选题】下列协议中,在无线网络中用于进行信道共享的协议是哪个?
A.
CSMA/CD
B.
CSMA
C.
CSMA/CA
查看完整题目与答案
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
celebrate African Americans’harvesting skills.
B.
honor Dr.Maulana Karenga.
C.
encourage African Americans to think about their roots.
D.
light the individual candles of the kinara.
查看完整题目与答案
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
drumming and rituals.
B.
dancing and singing.
C.
dialogue.
D.
solitude and silence.
查看完整题目与答案
【简答题】Directions: Choose the words below and fill in the blanks. promising // at times // related no wonder // published // plugged in // in the absence of // urge // interact // media // for a while // stu...
查看完整题目与答案
【单选题】It pays ______ to buy goods of high quality.
A.
at the end
B.
in conclusion
C.
at length
D.
in the long run
查看完整题目与答案
【单选题】It pays______the long run to buy goods of high quality.
A.
for
B.
in
C.
on
D.
to
查看完整题目与答案
【单选题】禁止某些IP段的匿名用户访问FTP服务器,需要对ftp服务主配置文件添加哪些命令字段?
A.
local_enable=YES
B.
tcp_wrappers=YES
C.
anon_upload_enable=YES
D.
write_enable=YES
查看完整题目与答案
相关题目：
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
the first song of the month
B.
the first corn of the harvest
C.
the first dance of the night
D.
the first fruits of the harvest
查看完整题目与答案
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
unity
B.
faith
C.
creativity
D.
responsibility
查看完整题目与答案
【简答题】三菱PLC的输入接线端子用文字符号 表示,输出接线端子用文字符号 表示。
查看完整题目与答案
【单选题】下列协议中,在无线网络中用于进行信道共享的协议是哪个?
A.
CSMA/CD
B.
CSMA
C.
CSMA/CA
查看完整题目与答案
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
celebrate African Americans’harvesting skills.
B.
honor Dr.Maulana Karenga.
C.
encourage African Americans to think about their roots.
D.
light the individual candles of the kinara.
查看完整题目与答案
【单选题】Kwanzaa is a holiday celebrated by many African Americans from December 26 to January 1. It pays tribute to the rich cultural roots of Americans of African ancestry, and celebrates family, community,a...
A.
drumming and rituals.
B.
dancing and singing.
C.
dialogue.
D.
solitude and silence.
查看完整题目与答案
【简答题】Directions: Choose the words below and fill in the blanks. promising // at times // related no wonder // published // plugged in // in the absence of // urge // interact // media // for a while // stu...
查看完整题目与答案
【单选题】It pays ______ to buy goods of high quality.
A.
at the end
B.
in conclusion
C.
at length
D.
in the long run
查看完整题目与答案
【单选题】It pays______the long run to buy goods of high quality.
A.
for
B.
in
C.
on
D.
to
查看完整题目与答案
【单选题】禁止某些IP段的匿名用户访问FTP服务器,需要对ftp服务主配置文件添加哪些命令字段?
A.
local_enable=YES
B.
tcp_wrappers=YES
C.
anon_upload_enable=YES
D.
write_enable=YES
查看完整题目与答案