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【判断题】
振型是指弹性体或弹性系统自身固有的振动形式。可用质点在振动时的相对位置即振动曲线来描述。由于多质点体系有多个自由度,故可出现多种振型,同时有多个自振频率,其中与最小自振频率(又称基本频率)相应的振型为基本振型,又称第一振型。 在振动的任一时刻,各质点位移的比值保持不变,即振动的形状保持不变,将此振动形式称为振型。A.
正确
B.
错误
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C.
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D.
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B.
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D.
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A.
for the market of
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B.
因子的偏差平方和 的自由度为 .
C.
交互作用的偏差平方和 的自由度为 .
D.
误差平方和 的自由度为 .
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A.
in the market for
B.
for the market of
C.
on the market about
D.
inside market to
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A.
in the market for
B.
for the market of
C.
on the market about
D.
inside the market to equipment.
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