【单选题】【消耗次数：1】
一单自由度振动体系，阻尼比为ξ=0.05，则共振时的动力系数为β等于（ ）。
①
5
②
10
③
15
④
20
参考答案：
复制
纠错
相关题目
【单选题】
在单自由度体系受迫振动的动位移幅值计算公式ymax=βyst中，yst是（ ）。
①
质量的重力所引起的静位移
②
动荷载的幅值所引起的静位移
③
动荷载引起的动位移
④
质量的重力和动荷载共同引起的静位
随机题目
【单选题】
I don’t quite remember the key ____ the question though I answered it correctly.
①
of
②
to
③
for
④
about
【单选题】
The city ______ its birth-rate by almost 60% in the past 20 years.
①
cuts
②
has been cut
③
cut
④
has cut
【单选题】
There are many ____ between the young and the old about their dreams.
①
difficult
②
differences
③
different
④
difficulties
【单选题】
Now that we’ve ____, can we come to a decision?
①
thought over
②
thought of
③
thought through
④
thought about
【单选题】
This year’s total output value of industry and agriculture will increase ____ 5 percent over last year.
①
to
②
of
③
with
④
by
【单选题】
They are working hard to____ what they have lost.
①
make out for
②
keep up with
③
catch up with
④
make up for
【单选题】
How can he ______ if he is not ______ ?
①
listen; hearing
②
hear; listening
③
be listening; heard
④
be hearing; listened to
【单选题】
This ATM has been out of service for a few days. It should ____ last week.
①
be fixed
②
have fixed
③
fix
④
have been fixed