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问题 单项选择题

移动现场的风机必须先拉闸断电，停止后再操作，发现风机护罩缺损、外壳接地不良要及时通知（）处理。

A.值班主任

B.班组长

C.CR1

D.值班电工

答案

参考答案：D

改错题

改错。

( )1. Did you enjoy you yesterday, my children? ________

             A           B      C                           D

(     )2. He taught his son how mend bikes. ________

                   A      B          C              D

(     )3. It's very hot outside or it's cool here in the room. ________

                         A              B        C                 D

(     )4. Let me to help you look for your ruler. ________ 

                      A   B              C               D

(     )5. Our teacher said the earth went round the sun. ________ 

                     A       B                   C      D

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多项选择题

决定燃气互换性的指标是（）

A、燃气热值

B、华白指数

C、燃烧势

D、汽化潜热
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