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【单选题】
DSC单频遇险呼叫尝试就在中频、高频或甚高频频带中的一个频率上，连续发送____ DSC遇险呼叫。A.
三次
B.
四次
C.
五次
D.
二次
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反馈参考答案：
举一反三
【简答题】不同代谢途径可以通过交叉点代谢中间物进行转化，在糖、脂、蛋白质及核酸的相互转化过程中三个最关键的代谢中间物是______、______和______。
【简答题】How can we get rid of garbage? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today. Some people think that man might b...
【简答题】"七月流火”指天气（）。
【单选题】Passage Three How can we get rid of garbage.9 Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today. Some people think t...
A.
The shortage of energy and air pollution.
B.
The shortage of energy and the land to hold garbage.
C.
Air pollution and the shortage of fossil fuel.
D.
Air pollution and the shortage of land to hold garbage.
【单选题】How can we get rid of garbage? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today. Some people think that man might b...
A.
The shortage of energy and air pollution.
B.
The shortage of energy and the shortage of empty land for holding garbage.
C.
Air pollution and the shortage of empty land for holding garbage.
D.
Air pollution and the shortage of fossil fuel.
【单选题】How can we get rid of garbage? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today. Some people think that man might b...
A.
The shortage of energy and air pollution.
B.
The shortage of energy and the shortage of empty land for holding garbage.
C.
Air pollution and the shortage of empty land for holding garbage.
D.
Air pollution and the shortage of fossil fuel.
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