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【单选题】
在蜗杆蜗轮传动中,轮齿间的啮合是____ 。A.
不确定
B.
线接触
C.
面接触
D.
点接触
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举一反三
【单选题】In order to insure that the racon signal is visible on your 3 cm radar, the ______.
A.
10 cm radar should be placed on stangby or turned off
B.
gain control should be turned to maximum
C.
radar should be stabilized, head up
D.
rain clutter control should be off but, if necessary, may be on low
【简答题】两个方向的列车必须在车站进行交会的列车运行图是( )。
【单选题】In order to insure that a RACON signal is displayed on the radar, you should ______.
A.
increase the brilliance of the PPI scope
B.
turn off the interference controls on the radar
C.
use the maximum available range setting
D.
increase the radar signal output
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