418.Arrows shall be used to indicate flow direction when needed to
understand the schematic diagram.

　When you need to understand a schematic diagram,use arrows to indicate
flow orienting.

　Arrows shall be used to indicate flow ends when needed to understand
the schematic diagram.

　When need to comprehend the chart,you should use arrows point to the
direction.

正确答案：A

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353.The same symbol, device, or code shall be used throughout the Handbook
to depict the same system, valve or control.

352.INSTALL CAPS ON THE RECEPTACLES TO MAKE SURE THAT UNWANTED MATERIAL

351.Each Chapter or Section is to start with a general description of
the system and its operation and should be labeled Description and
Operation.

350.文档制作者可以在空白页之前或之后的页上使用双页编号,而不是在空白
页上打印“本页有意空白”。

349.清洁表面,以确保粘附牢固。

348.When the wind speed decreases to less than 30 knots, you can open
the cargo door.

347.Turn the cap counterclockwise.

346.如果风速高得危险,请不要打开货舱门。

345.标准化将通过统一解释根据本规范编制的持续适航方案中包含的检查要求
来提高安全性。

344.只有批准人员才能操作刹车。

418.Arrows shall be used to indicate flow direction when needed tounderstand the schematic diagram.