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【多选题】
以下关于光纤通信和卫星通信对比,说法正确的有哪些? What are the following statements about the comparison between optical fiber communication and satellite communication are true?A.
卫星通信的空口损耗高。 Satellite communication has high air loss.
B.
卫星通信可以实现高覆盖率但难以支持超大带宽的数据容量。 Satellite communications can achieve high coverage，but it is difficult to support the data capacity of ultra-large bandwidth.
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【简答题】葡萄黒痘病,绿果被害,病斑__形,周缘________色,中央呈_________色,_____,似“鸟眼”状。
【单选题】______, they missed the last bus. [ ]
A.
At first
B.
Final
C.
In the end
D.
At the end
【单选题】Last night, Mark said that he ______the book by the end of next week.
A.
will finish read
B.
would have finished reading
C.
had finished reading
D.
is going to finish reading
【简答题】By the end of last year, nearly a million cars (produce) ______ in that auto factory.
【简答题】By the end of last year the students (learn) ______ nine subjects.
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