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【单选题】
1型系统对数幅频特性的低频段渐近线斜率为A.
-60(dB/dec)
B.
-40(dB/dec)
C.
-20(dB/dec)
D.
0(dB/dec)
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皮皮学刷刷变学霸
举一反三
【单选题】People in the 1th and 1th centuries slept about . hours a night because ______.
A.
they were forced by their parents to do so
B.
they knew what was best for their health
C.
they had to do so because of their life style. and the lack of electricity
D.
they were not so dynamic and ambitious as modem people are
【单选题】Where is the man going?
A.
He's going to a post office.
B.
He's going to school.
C.
He's going home.
【单选题】What's John going to do?
A.
He's going to work.
B.
He's going to buy a new TV set.
C.
He's going to ask someone to fix his TV set.
【单选题】流行病学科的三大要素是指:
A.
描述分布、提出假设、验证假设
B.
原理、方法、应用
C.
揭示现象、找出原因、提供措施
D.
描述、分析、验证
E.
疾病、伤害、健康
【简答题】Sometimes it is difficult to compare money values in different periods of history because______.
【简答题】病害流行的三要素是指( )、( )、( )。
【单选题】Both approaches require that the actor ______ his or her own personal values as well as the character's.
A.
must understand
B.
should understand
C.
has to understand
D.
need to understand
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