题目内容

对于二氧化硫（S0₂）下列说法哪个不正确（）。

A. 它的水溶液也称亚硫酸（H₂S0₃）
B. 会腐蚀大理石
C. 对人体无危害

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钢筋拉伸试验中，若试样断在机械刻划的标距标记上，且断后伸长率小于规定最小值，该试验结果无效，应重新做同样数量试样的试验。

A. 正确
B. 错误

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Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.

A. closed, and no leakage permitted across the shaft packing
B. closed, and only slight leakage permitted across the shaft packing
C. open, and no leakage permitted across the shaft packing
D. open, and only slight leakage permitted across the shaft packing

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