哪些说法是正确的

19.If the components fall, permanent damage can occur( )

18.该规范的目的是为了将通用航空飞机所有者和运营人以及维修人员的成本降到最低。( )

17.Always use these words with their approved meanings ( )

16.在机库中不要做这个程序。 ( )

15.( ) 5 ml OF HARDENER TO THE COMPOUND ( )

14.[ FROM THE EXHAUST AREA BEFORE THE ENGINE STARTS( )

13.DO NOT LET THE HEATER [ ]TOO HOT( )

12.When an illustration is required to be reproduced horizontally on a page, the top of the illustration shall always be toward the left edge of the sheet ( )

11.这种材料接触热表面时会释放出危险的气体。 ( )

10.在这种构型中,液压旁通此活门。( )