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【单选题】
审美偏好是依据什么为标准的?A.
客观大众
B.
客观个人
C.
主观个人
D.
主观大众
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【简答题】Natural light with intensity I and linear polarized light with intensity 3I both fall on a polarizer, the total transmitted intensity is 2I. What is the angle θ between the axis of polarizer and polar...
【简答题】Some children are natural-born bosses. They have a strong need to make decisions, manage their environment, and lead rather than follow. Stephen Jackson, a Year One student, “operates under the theory...
【简答题】C Some children are natural-born bosses. They have a strong need to make decisions, manage their environment, and lead rather than follow. Stephen Jackson, a Year One student, “operates under the theo...
【单选题】听力原文： Some children are natural born bosses. They have a strong need to make decisions, manage their environment, and lead rather than follow. Stephen Jackson, a Year One student, 'operates under the ...
A.
They may probably become lonely.
B.
They may probably become skilful.
C.
They may probably become relaxed.
D.
They may probably become hesitant.
【单选题】要求设计输出转矩T=52.5N・m,转速n=30r/min的轴向柱塞式液垣马达,设马达的排量q 0 =105cm 3 /r,求所需要的流量和压力各为多少(马达的机械效率及容积效率各为0.9)?
A.
(1)流量:3.5L/min; (2)压力:3.49 x 10 6 Pa=3.49Mpa
B.
(1)流量:3.5L/min; (2)压力:3.49 x 10 6 Pa=3.49Mpa A .(1)流量:3.5L/min; (2)压力:3.49 x 10 8 Pa=3.49Mpa B .(1)流量:3.7L/min; (2)压力:3.49 x 10 6 Pa=3.49Mpa
【简答题】2课堂练习.图所示系统中,液压泵的排量 q 1 =115mL/r ,转速 n 1 =1000r/min ,容积效率 η v1 =0.93 ;液压马达的排量 q 2 =148 mL/r ,机械效率 η m2 =0.9 ,总效率 η 2 =0.84 ,输入压力 p 21 =8.3Mpa ,不计管道损失。 (1) 液压泵的实际输出流量为 ________L/min (保留两位小数)。 (2) 液压马达转...
【简答题】某液压马达的排量 V=70ml/r ,供油 压力 p= 10 MPa ,输入流量为 q=100L / min , 容积效率为 0.9 2 ,机械效率为 0.9 4 , 马达回油背压 为 0. 2 MPa 。求: ( 1 ) 马达的输出转矩 T m =________Nm ( 2 ) 马达的输出转速 n m =________r/min
【简答题】In this chapter we focus on how to arrange your gathered material in the form of an argument.
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