题目内容
（请给出正确答案）
A.Directing the beam of a searchlight at another vessel
B.A smoke signal giving off orange colored smoke
C.A whistle signal of one prolonged and three short blasts
D.International Code Signal PAN spoken over the radiotelephone
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“Which signal is recognized as a distress signal （).”相关的问题
A、both firms would a high price.
B、both firms would charge a low price.
C、only Zeta would charge a low price.
D、only Omega would charge a low price.
Existing research shows that both male and female shift workers express high levels of stress and a sense of conflict between the demands of work and family life. But shift work couples still maintain a traditional attitude to the meaning of marriage and the individual roles of husband and wife. They expressed a willingness to do "whatever it takes" to approximate their view of a proper marriage, including sacrificing sleep and doing conventional things at unconventional hours. For the majority of couples interviewed, even when wives worked outside their homes, a proper marriage is characterized by a very clear division of roles: husbands are "providers" whose major responsibility is to support the family; wives are "homemakers" who clean, cook, and care for husbands and children.
The women's definitions of a "good husband" are typified by the following wife's response:
I expect him to be a good provider, and be there when I need him, loyal about the same things as he would expect out of me, expect that I expect him to dominate over me. But in a manner of speaking, when it's time to be a man I expect him to stand up instead of sitting back expecting me to do everything.
To husbands, a good wife is someone who is:
Understanding of what I feel go through at work. I need that respect at work, I hope I get it at work, I want my wife to realize what I expect at work. I don't want her to give me a lot of shit when I come home from work because I don't know if this makes much sense.
These views seemed critical to maintain the families of the shift workers.
Despite______,shift work couples still hoped to maintain a stable life.
A．traditional beliefs about marriage
B．lack of control over time
C．a very clear division of roles
D．the demands of work
A、DSB与SSB解调增益都是1
B、DSB解调增益都是1，而SSB解调增益都是2
C、DSB解调增益都是2，而SSB解调增益都是1
D、SSB解调增益也是1，但是因为SSB节约了传输带宽，所以SSB解调性能比DSB要好。
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