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【单选题】
双曲线中，2c,e别表示（）A.
长轴长，短轴长
B.
虚轴长，离心率
C.
焦距，离心率
D.
半焦距，离心率
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反馈参考答案：
举一反三
【单选题】Whenever it ______ the money I lost, my father always tells me to learn a lesson from the event and never ______ such trick again! [ ]
A.
refers to; fall in
B.
comes to; fall for
C.
mentions; fall on
D.
speaks to; fall to
【单选题】如图所示为示波器测量正弦波波形参数的画面，若“TIME/DIV”的指示值是5μs，则所测正弦波的频率为（）
A.
100kHz
B.
50kHz
C.
25kHz
D.
20kHz
【单选题】In addition to walking, I can______ to help with the event. Please contact me.
A.
resist
B.
decline
C.
vanish
D.
volunteer
【单选题】At the end of the day, you want all attendees _____ your event to remember this key message that you’ve spent a long time reinforcing.
A.
leave
B.
to leave
C.
leaving
【单选题】如图所示为示波器测量正弦波波形参数的画面,若“ TIME/DIV ”的指示值是 5μs ,则所测正弦波的频率为 ( )
A.
． 100kHz
B.
．50kHz
C.
C．25kHz
D.
D．20kHz
【单选题】如图所示为示波器测量正弦波波形参数的画面,若“ VOLTS/DIV ”的指示值是 2V ,则所测正弦波的峰值为 ( )
A.
． 9.2V
B.
．4.6V
C.
C．6.5V
D.
D．3.25V
【单选题】For me a (major) life event that changed my self-identity is getting married.
A.
good
B.
critical
【单选题】如图所示为示波器测量正弦波波形参数的画面，若“VOLTS/DIV”的指示值是1V，则所测正弦波的有效值（）
A.
4.6V
B.
2.3V
C.
3.25V
D.
1.63V
【简答题】I would be grateful ______________ you for telling me your views on that .
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