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【单选题】
已知某放大电路电压增益的 频率特性表达式为:( 式中 f 的单位为 Hz ) 试求该电路的下限频率。A.
25 Hz
B.
20 Hz
C.
15 Hz
D.
10 Hz
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【判断题】Make sure you give yourself enough time to complete your usual morning ritual without having to rush yourself or stress out.
A.
正确
B.
错误
【简答题】Without noticing it we may fail to ___ enough time and effort in maintaining our relationships.
【单选题】—They have hurried to the concert without us. — There is quite enough time to spare.
A.
You said it.
B.
You don’t say!
C.
You can say that again.
D.
You don't know the half of it!
【单选题】如图9-6所示,某台液压泵如果不是直接从液面为大气压力的油箱中吸油,而是采用压力位P2的辅助低压系统向该泵供油。假设泵转速、效率以及液压缸的负载F均不变,试说明采用辅助低压系统后下述参数如何变化:1、泵的输出压力P1();2、泵的输出流量q();3、泵的输入功率P()。
A.
增大、不变、不变
B.
增大、不变、减小
C.
不变、不变、减小
【单选题】-They have hurried to the concert without us. - There is quite enough time to spare.
A.
You said it.
B.
You don't know the half of it!
C.
You can say that again.
D.
You don ' t say!
【单选题】Without putting in enough time and energy, your chances of success in learning second language is ( ).
A.
slam
B.
slim
【单选题】某台液压泵如果不是直接从液面为大气压的油箱中吸油，而是采用压力为p2的辅助低压系统向该泵供油。假设泵转速、效率以及液压缸的负载均不变，试分析采用辅助低压系统后，泵的输出流量qp 如何变化？
A.
增大；
B.
减小；
C.
不变；
D.
先增大后减小。
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【简答题】Without noticing it we may fail to ___ enough time and effort in maintaining our relationships.