单选题To prevent accidents from occurring, special valve chests are used in such cases in which interchangeable blanks and connecting passages are incorporatedThe bold and italic word “which” means （）.AaccidentsBspecial valve chestsCinterchangeable blanksDconnecting passages
单选题
To prevent accidents from occurring, special valve chests are used in such cases in which interchangeable blanks and connecting passages are incorporatedThe bold and italic word “which” means （）.
A
accidents
B
special valve chests
C
interchangeable blanks
D
connecting passages
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