实践测算出到达人耳的直达声和延迟声，两者的时间差为（）ms混响_爱下问搜题

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问题单项选择题

实践测算出到达人耳的直达声和延迟声，两者的时间差为（）ms混响效果较好.

A.90

B.104

C.120

D.140

答案

参考答案：B

完形填空

       This is a   1    of David's family. This man    2   Mr Brown.   3   is David's father. He is a
worker.   4   woman is Mrs. Brown.  5   is David's mother. She is a teacher. Who   6   this boy
and   7    girl? The    8   is David, Mr. Brown's son. The girl is Tina, Mr. Brown's   9   .Tina is
  10  .David and Tina are brother and sister.

( )1. A. map
( )2. A. am
( )3. A. Her
( )4. A. This
( )5. A. Her
( )6. A. am
( )7. A. a
( )8. A. boy
( )9. A. sister
( )10.A. David

B. book
B. is
B. She
B. These
B. She
B. is
B. an
B. boys
B. cousin
B. Davids

C. photo
C. are
C. His
C. A
C. His
C. are
C. this
C. girl
C. daughter
C. David's

D. room
D. be
D. He
D. An
D. He
D. be
D. these
D. girls
D. brother
D. the David

选择题

如图A-10-45-10所示的电路中，电源内阻不能忽略，R₁="10" Ω，R₂="8" Ω，当开关S板到位置1时，电压表的读数为2．0 v，当开关S板到位置2时，电压表的读数可能是 ( )

A．2.2 V

B．1.9 V

C．1.6 V

D．1.4 V