If the towing bridle legs are not of equal length（）. excessive strain is placed on the shorter leg。 the shorter leg may fail。 the longer leg is slack。 All of the above。
在扒装珠光砂时要注意哪些安全事项？
游梁式抽油机调冲次操作中，人身伤害主要包括（） 机械伤害。 中毒。 触电。 着火。
游梁式抽油机调冲次操作中，检查安装质量内容包括（） 观察皮带轮有无摆动现象。 测电流。 检查抽油机平衡率。 校对抽油机冲次。
If a vessel under tow starts jumping on its tow line，the most appropriate action to alleviate the condition is to（）. change course。 slow down。 heave to。 adjust tow line length。
Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）
