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【单选题】
臭氧由三个氧原子组成,在常压下,呈淡( )。A.
粉色
B.
蓝色
C.
紫色
D.
绿色
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反馈参考答案：
举一反三
【单选题】在总账系统中查询未记账凭证科目汇总表时，屏幕上背景为蓝色的数据具有辅助核算，这时单击工具栏()按钮，可以查看其明细信息。
A.
“专项”
B.
“查询”
C.
“详细”
D.
“转换”
【单选题】在多普勒效应模型中，若一架飞机以v=400m/h的速度飞向一观察者，观察者静止不动，若飞机发射声波的频率fs=1，声速vs=757m/h，那么观察者接收到的声波频率为（ ）
A.
1.53
B.
0.47
C.
2.12
D.
0.65
【单选题】Section ADirections: In this section, you will hear 8 short conversations and 2 long conversations.At the end of each conversation,one or more questions will be asked about what was said. Both the con...
A.
Because the woman want to write something about Apollo 11.
B.
Because the woman doesn't want to continue her former paper topic
C.
Because the woman has found an interesting job.
D.
Because the woman showed him some pictures on her thesis.
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
She conducted the classical chapters pretty well.
B.
The chapters she composed and conducted were all in harmony.
C.
She composed the harmonious chapters by herself.
D.
The classical chapters composed by her were in harmony.
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
They prefer to carry cash when traveling abroad.
B.
They usually carry many things around with them.
C.
They would rather travel around than stay at home.
D.
They don't like to spend much money on traveling
【简答题】阅读理解。 Several years ago, my family gathered on Cape Cod for a weekend. My parents were there, my sister and her daughter too, two cousins and, of course, my wife, my son and me. We ate at one of those...
【单选题】在多普勒效应模型中，若一架飞机以v=400m/h的速度飞向一观察者，观察者静止不动，若飞机发射声波的频率fs=1，声速vs=757m/h，那么观察者接收到的声波频率为（）(声源接近观察者时【图片】)
A.
1.53
B.
0.47
C.
2.12
D.
0.65
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