题目内容

【C16】

A. preference
B. innovation
C. progress
D. territory

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【C5】

A. active
B. leading
C. important
D. dual

【C13】

A. shift
B. necessity
C. clash
D. display

A _____, sometimes called filters, is a device designed to prevent the passage of unwanted

A. steam trap
B. check valve
C. separator
D. strainer

【C19】

A. hung
B. mounted
C. concealed
D. shielded