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【判断题】
车站是铁路运输的基层生产单位,对保证运输工作质量起着决定作用。A.
正确
B.
错误
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【单选题】在相同的条件下，在输电线路的同一点发生三相或两相短路时，保护安装处母线相间的残压（ ）。
A.
(A)相同
B.
(B)不同
C.
(C)两相短路残压高于三相短路
D.
(D)三相短路残压高于两相短路
【单选题】在相同的条件下,在输电线路的同一点发生三相或两相短路时,保护安装处母线相间的残压( )。
A.
相同;
B.
两相短路残压高于三相短路;
C.
不同;
D.
三相短路残压高于两相短路。
【单选题】在相同的条件下,在输电线路的同一点发生三相或两相短路时,保护安装处母线相间的残压( )
A.
相同
B.
不同
C.
两相短路残压高于三相短路
D.
三相短路残压高于两相短路
【单选题】The figure shows a bar moving to the right on two conducting rails. To make an induced current i in the direction indicated, a constant magnetic field in region A should be in what direction?
A.
Into the page
B.
Out of the page
C.
Left
D.
Right
【简答题】(Figure: Bicycles and Radishes I) The figure shows production possibility frontier for two countries that produce only radishes and bicycles. The axes of both graphs are measured in equivalent units. ...
【单选题】智能蔬菜种植箱可以自动调节箱内的温度与光照,并能自动浇水,实现这些功能通常不会用到的传感器是______
A.
温度传感器
B.
光线传感器
C.
湿度传感器
D.
红外传感器
【单选题】The figure shows the employment rates of 20- to 24-year-olds in the U.S., by sex and educational attainment in 2016. Answer the question according to the information in the figure. Which of the follow...
A.
The employment rate is higher for young adults with higher levels of educational attainment than for those with lower levels of educational attainment.
B.
The difference between the employment rates for females and males becomes larger with the increase in educational attainment.
C.
For females, the employment rate without completing high school is more than two times lower compared with the rate for those with a bachelor's or higher degree.
D.
among young adults, employment rates are higher for males than for females at each level of educational attainment.
【简答题】6-1 图 示矩形截面简支梁,承受均布载荷 q 作用。若已知 q = 2 kN/m , l = 3 m , h = 2b = 240 mm 。试求截面横放 ( b) 和竖放 ( c) 时梁内的最大正应力,并加以比较。
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