题目内容

大山雀的巢一般是位于:()

A. 很密的灌木树杈上
B. 多数在灌木下的草地上
C. 通常是用草茎编织并悬挂在离地3米高的树杈上
D. 在树洞中

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如何利用目镜测微尺测量微生物细胞的大小?

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

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

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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