(单项选择)“受弯直杆发生弯曲变形后,杆件两端点间的距离不变。”是位移法中受弯直杆的“轴向刚度条件”。 ( )(本题5.0分)
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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