When the tail-shaft is drawn from a vessel in dry-dock, which of the following inspections is required to be carried out?()
A. The propeller hub taper and shaft keyway should be inspected for cracks or corrosion
B. The stern bearing alignment with the stern frame should be checked
C. The interior of the stern tube should be inspected for leaks
D. The shaft liner should be removed and inspected
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属于A类的作业,施工负责人在作业令规定施工开始时间()前到车站填写《车站施工登记表》。
A. 15分钟
B. 20分钟
C. 30分钟
D. 60分钟
选择了Photoshop“调整”子菜单中的“曲线”命令后,分别选择通道中的R、G、B通道,然后改变曲线的形状就可以调整影像的色彩。
A. 正确
B. 错误
“那是一条神奇的天路哎,带我们走进人间天堂。”青藏铁路的开通,多少人被感动,感动得热泪盈眶;多少人又在奉献着,奉献着自己的热血年华。党中央国务院决定修建青藏铁路是在()年.
A. 1974
B. 1979
C. 1985
D. 1990