如何计算平行圈弧长？比较子午圈弧长和平行圈弧长的变化区别。

弧长的标注以角的两边作为尺寸界线，尺寸线画成圆弧，圆心是角的顶点，起止符号以箭头表示。

在Excel2003中，假定单元格B2和B3的值分别为5和10，则公式=OR（B2>5，B3>=8）的值为（）。

已知某班级高等数学期末考试成绩中位数为72分，算术平均数为69分，则该班级学生高等数学成绩的众数的近似值为（）

焊接过程中，焊机的负载总是在不断地变化着，焊接过程中（）能引起弧长的变化甚至短路等。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。