桁梁杆件有洞孔，洞孔直径大于或等于杆件宽度的（）倍时，应及时进行整修、加固或更换。
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所谓广告调查，应包括为发展广告运动所进行的（），以及围绕广告信息传播所展开的（）。
储罐修理完毕，在罐底（）合格后，根据检修的具体内容和实际情况，有选择的进行充水试验
What is the purpose of cant frames in steel vessels? （）
A. To support the overhang of the stern
B. To provide strength to shell plating at the stern
C. To add strength to the deck beams which support the weather decks
D. To support the plating of a cylindrical tank
The center line condition of the transmission shaft can be checked by（）
A. the border flange’s excursion and flection
B. the both end shafts line’s accordance
C. the border flange’s flection and the both end shafts line’s accordance
D. the border flange’s accordance and both end shafts flection degree
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