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问题 选择题

若在枪管口安装“消音器”，可以降低枪声的

A．响度

B．音色

C．音调

D．频率

答案

答案：A

题目分析：消音器降低的是声音的响度，不能改变声音的音色和音调。如果把整把枪看作一个声源，那么消音器是在声源处减弱噪声。

多项选择题

在可靠性分配中常用方法有( )。

A．评分分配法

B．比例分配法

C．随机分配法

D．平均风险法

E．专家分配法
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单项选择题

Which of the following groups is defined as "newlyweds"

Which of the following groups is defined as "newlyweds"
A．Couples who are married for less than two years.
B．Couples who are married for less than five years.
C．Couples who are married for more than five years.
D．Couples who are married for more than twenty years.

A．Couples who are married for less than two years.

B．Couples who are married for less than five years.

C．Couples who are married for more than five years.

D．Couples who are married for more than twenty years.
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