液硫管道属于（），内层管道输送液体硫磺，外层管道通蒸汽。 A._爱下问搜题

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问题单项选择题

液硫管道属于（），内层管道输送液体硫磺，外层管道通蒸汽。

A.夹套管

B.伴热管

C.保温管

D.蒸汽管

答案

参考答案：A

单项选择题

Questions 24-30

·Look at the questions for this part.
·You will hear a passage about "Health and Fitness ". You will listen to it twice.
·For Questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B, or C on the Answer Sheet.

Which of the following mass media is NOT mentioned as a carrier of information on nutrition and proper diet

A．Radio.

B．Television.

C．Newspapers.

判断题

最先试用者和晚期采用者所占比例比较小。