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【单选题】
以下常见信道中,不属于随参信道的是( )。A.
卫星 中继信道
B.
电离层散射信道
C.
电离层反射信道
D.
对流层散射信道
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反馈参考答案：
举一反三
【简答题】波长为( )—( )μm的部分称为热红外线。我们周围的物体只有当它们的温度高达( )°C以上时,才能够发出可见光。相比之下,我们周围所有温度在绝对零度(-273°C)以上的物体,都会不停地发出热红外线。
【单选题】On a cargo ship, fire and boat drills are carried out _____.
A.
once a week
B.
once a month
C.
once a year
【简答题】Once upon a time there were two good friends. One is a captain of a ship ,the other is a merchant (商人). The merchant had a young son，who wanted to be a sailor ，so the captain took him for voyages(航海) ...
【单选题】因旅行社原因造成旅游者未能乘坐预订的公共交通工具的,旅行社应赔偿旅游者的直接经济损失,并支付直接经济损失( ) 的违约金
A.
0.1
B.
0.2
C.
0.3
D.
0.5
【单选题】The Ship Security Alert System is checked once a month
A.
The SSAS is checked two times a month
B.
The SSAS is checked one time a month
C.
The SSAS is checked once a week
D.
The SSAS is checked every week
【单选题】Once a ship, you don't need to worry about meals or entertainment.
A.
on occasion
B.
on board
C.
in position
D.
in operation
【单选题】On a ship，a fire drill shall be conducted once every（）.
A.
week
B.
month
C.
crew change
D.
other week
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