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 （）.<br>A:accidents<br>B:special valve chests<br>C:interchangeable blanks<br>D:connecting passages

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

出自：海船船员证

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