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某轴心受压钢构件绕x轴和绕y轴属于同一条的柱子曲线（即ф-λ关系曲线或表格），则，两轴等稳定的条件是

单选题
2021-07-17 23:29
A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/b353227b-7d4e-4de2-a220-66022198bf06.jpg"title="ex_1301401024514_0.jpg" alt="ex_1301401024514_0.jpg"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/8ae496e6-432c-43a3-86a3-9102860b8984.jpg"title="ex_1301402073120_0.jpg" alt="ex_1301402073120_0.jpg"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/b79bcb53-b39e-406f-b1d2-2a16cf655bd3.jpg"title="ex_1301402079790_0.jpg" alt="ex_1301402079790_0.jpg"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e6cdc944-a7ac-4682-80f7-1795de14c07c.jpg"title="ex_1301402082082_0.jpg" alt="ex_1301402082082_0.jpg"/>
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（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.
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Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.
The（）may examine or re-examine the goods or take samples from them straightaway in the absence of the consignee or the consignor whenever it considers this necessary.
（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.
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逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。
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A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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（）means any person by whom or in whose name or on whose behalf a contract of carriage of goods by sea has been concluded with a carrier，or any person by whom or in whose name or on whose behalf the goods are actually delivered to the carrier in relation to the contract of carriage of goods by sea.
If he is a common carrier，he is absolutely responsible to the owner of the goods carried （）any loss or damage to them unless caused by an Act of God or the Queen’s enemies，or the inherent vice in the goods themselves，or the negligence of the owner of the goods，or a general average sacrifice.
系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。
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