Which precaution should be taken when testing a line throwing gun?（）<br>A:Never remove the line from the rocket<br>B:Fire it at an angle of approximately 90 degrees to the horizon<br>C:Wear asbestos gloves<br>D:All of the above

Which precaution should be taken when testing a line throwing gun?（）
A:Never remove the line from the rocket
B:Fire it at an angle of approximately 90 degrees to the horizon
C:Wear asbestos gloves
D:All of the above

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