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一冷却器由20根φ20mm×2mm(即管的外径为20mm,壁2mm)的列管组成,冷却水由468mm×2mm的导管流入列管中,已知导管中的流速为1.5m/s,求列管中的水流速度。
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【多选题】企业针对环境威胁的对策有 ( )。
A.
果断放弃策略
B.
对抗策略
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Trading securities are accounted for using fair values with unrealized gains and losses reported in other comprehensive income.
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Trading securities are accounted for using fair values with unrealized gains and losses reported in net income.
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Available-for-sale securities are accounted for using fair values with unrealized gains and losses reported in other comprehensive income.
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