题目内容

【C5】

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

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【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

【C6】

A. spending
B. section
C. proportion
D. income