题目内容

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

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

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【C19】

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

【C6】

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

【C4】

A. involved in
B. contributed to
C. resulted from
D. consisted of

指令的解释是由计算机的()来执行的.

A. 控制部分
B. 存储部分
C. 输入/输出部分
D. 算术和逻辑部分