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【单选题】
系统的传递函数 G(s)=18/(s 2 +2s+36),其阻尼比ζ是( )。A.
1/12
B.
1/2
C.
2
D.
1/6
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【单选题】The football player had studied economics in the university for ______ of roughly six years.
A.
a decade
B.
a time
C.
an age
D.
a period
【单选题】( ) 2. —What do children do at Halloween? — ________
A.
They are working.
B.
They are funny.
C.
They wear scary clothes.
【多选题】What do children do to celebrate Halloween?( 多选)
A.
They put on fancy clothes and masks.
B.
They will go to people ’ s house and say “ Trick or Treat ”
C.
They will eat pumpkins.
【单选题】How often does the man use the airport?
A.
About twice a month.
B.
Twice a year.
C.
About once a year.
【单选题】根据《标准化法》关于企业标准的说法,正确的是
A.
企业标准的制定应当经过行业主管部门批准
B.
企业标准可以高于国家标准的
C.
企业标准应当高于行业标准
D.
企业标准应当与团体标准相符
【单选题】According to the woman, how can the man get a discount?
A.
By paying a year's fee in a lump sum.
B.
By knowing someone who had taken a lesson before.
C.
By coming back during the sale period.
D.
By purchasing a certain number of items.
【单选题】What do children do on Halloween?
A.
They put on clothes and masks.
B.
They put on fancy clothes and masks.
C.
They go from house to house and say," Trick or Treat".
D.
Both B and C
相关题目：
【单选题】根据《标准化法》关于企业标准的说法,正确的是
A.
企业标准的制定应当经过行业主管部门批准
B.
企业标准可以高于国家标准的
C.
企业标准应当高于行业标准
D.
企业标准应当与团体标准相符