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【单选题】

Questions 19 to 22 are based on the conversation you have just heard.

A.
He feels rushed.
B.
He hates to pack.
C.
He doesn’t like to restrict his diet.
D.
He’s worried about his lecture.
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参考解析:
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【单选题】Everyone has heard the phrase "a picture is worth a thousand words". Videoconferencing provides that picture, bringing decision makers together for face-to-face meetings regardless of their location. ...

A.
expensive in installing the system
B.
efficient in saving employees for meetings
C.
worthwhile by not sending employees for meetings
D.
useful in changing boring meeting into exiting ones

【单选题】下列各项中对电火花加工精度影响最小的是()。

A.
放电间隙
B.
加工斜度
C.
工具电极损耗
D.
工具电极直径