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【多选题】
休息状态时全口义齿固位差、易脱落,可能是A.
印模变形
B.
模型变形
C.
取模时印模边缘长度不够
D.
义齿基托边缘过短
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【简答题】曲线命令较之色阶命令的优点是什么?
【单选题】在弹性限度内,弹簧的弹力大小与弹簧的伸长量成正比,即 F = kx ,其中 F 为弹力大小, x 为伸长量, k 为弹簧的劲度系数 。 已知某弹簧的劲度系数为 100N/m ,原始长度为 10 cm ,则在弹力为 5N 时,弹簧的长度可能为 ( )
A.
10m
B.
15cm
C.
20cm
D.
25cm
【单选题】When reservoir pressure is reduced below ( ) pressure, gas evolves in the reservoir, leaving less gas dissolved in the liquid.
A.
Sublimation point
B.
boiling-point
C.
freezing-point
D.
bubble-point
【判断题】Solar power has a low energy density, so requires large collecting devices. The potential energy of rainis naturally concentrated and held in mountain lakes; we concentrate this energy artificially wh...
A.
正确
B.
错误
【判断题】The total pressure drop at any point in a reservoir is the sum of the pressure drops at that point caused by flow in each well in the reservoir.
A.
正确
B.
错误
【单选题】在弹性限度内,弹簧的弹力大小与弹簧的伸长量成正比,即 F = kx ,其中 F 为弹力大小, x 为伸长量, k 为弹簧的劲度系数.已知某弹簧的劲度系数为 100 N/m ,原始长度为 10 cm ,则在弹力为 5 N 时 ( 不超过弹性限度 ) ,弹簧长度为( )
A.
10
B.
15
C.
20
D.
25
【单选题】在弹性限度内 , 弹簧的弹力大小与弹簧的伸长量成正比 , 即 F=kx , 其中 F 为弹力大小 , x 为伸长量 , k 为弹簧的劲度系数。已知某弹簧劲度系数为 100 N/m, 原始长度为 10 cm, 则在弹力为 5 N 时 , 弹簧长度可能为 ( )
A.
10 cm
B.
15 cm
C.
20 cm
D.
25 cm
【单选题】The children ______ many times not to swim in the reservoir.
A.
were being told
B.
have been told
C.
had being told
D.
told
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