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【简答题】
The Winter Olympics is also called the White Olympics. At this time, many colorful stamps are published to mark the great Games. The first stamps marking the opening came out on January 25, 1932 in the United States for the 3rd White Olympics. From then on, publishing stamps during the White Olympics became a rule. During the 4th Winter Olympic Games a group of stamps were published in Germany in November 1936. The five rings of Olympics were drawn on the front of the sportswear. It was the first time that the rings appeared on the stamps of the White Olympics. In the 1950’s, the stamps of this kind became more colorful. When the White Olympics came, the host countries( 东道国 ) as well as the non-host countries published stamps to mark those Games. China also published four stamps in February 1980, when the Chinese sports men began to take part in the White Olympics. Japan is the only Asian country that has ever held the White Olympics. Altogether 14,500 million stamps were sold to raise money for this sports meet. Different kinds of sports were drawn on these small stamps. People can enjoy the beauty of the wonderful movements of some sportsmen.
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【单选题】下列各种已调波中,哪一种信号的频带利用率最高()。
A.
调频波
B.
抑制载波的双边带信号
C.
单边带信号
D.
调相波
【简答题】面试可以使用人单位全面了解应聘者的‍ ‍ 面试可以使用人单位全面了解应聘者的 ‍ ‍ A.社会背景 B.反应能力 C.个人修养 D.逻辑思维能力 E.语言表达能力
【简答题】凡没有注明“不可转让”字样的信用证,即为可转让信用证。
【多选题】面试可以使用人单位全面了解应聘者()
A.
社会背景
B.
反映能力
C.
个人修养
D.
逻辑思维能力
E.
语言表达能力
【单选题】根据《跟单信用证统一惯例》的规定,信用证应该注明是可撤销的还是不可撤销的,未加注明的视为( )。
A.
不可撤销信用证
B.
可撤销信用证
C.
保兑信用证
D.
可转让信用证
【单选题】频分复用信号属于()。
A.
基带信号
B.
宽带信号
C.
单一信号
D.
未调制信号
【多选题】信号处理系统抑制基带信号中不需要的 ,提取回波中的感兴趣 。
A.
回波成分
B.
目标信息
【单选题】一次只在介质上发送一个信号,是()。
A.
基带信号
B.
宽带信号
C.
复合信号
D.
重复信号
【单选题】船舶单边带通信一般采用_____发射。
A.
下边带信号
B.
上边带信号
C.
下边带信号和载频
D.
上边带信号和载频
【单选题】下列哪种信号的传输带宽与AM信号传输带宽相同:
A.
基带信号
B.
双边带信号
C.
.单边带信号
D.
残留边带信号
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