油品储罐接地电阻不应大于(),输油管线接地电阻不应大于()。
参考答案:10Ω;30Ω
在下面的诗句中,有四句属于同一首诗,请将这四句挑出,并按原来的顺序排列。
1.千里黄云白日曛 2.遥看瀑布挂前川 3.独怜幽草涧边生
4.莫愁前路无知己 5.疑是银河落九天 6.北风吹雁雪纷纷
7.春潮带雨晚来急 8.草满池塘水满坡 9.天下谁人不识君
10.毕竟西湖六月中 11.千里莺啼绿映红 12.多少楼台烟雨中
原诗的顺序是____ , 作者是____ ,诗题是 。
阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡相应位置。
Unprecedented Aviation Mystery
A Boeing 777 took off from Malaysia’s largest city of Kuala Lumpur at 0:41 am on March 8.
小题1:_____destination was Beijing. But the flight never arrived, 小题2:______ (leave) friends and relatives of the passengers onboard weeping and worrying.
There were 239 people小题3:____ board the Malaysia Airlines flight,including China, Vietnam,the US,Singapore, and the Philippines 小题4:_______ still ______ (search)for the missing plane.
Its 小题5:__________ (disappear)is an "unprecedented(史无前例的)aviation mystery”, Azharuddin Abdul Rahmanm,head of Malaysia’s Civil Aviation Authority,said on March 10.
There was no sign of 小题6:____ crash.
About two hours of after taking off,air traffic control suddenly lost contact with the plane. The weather was clear,the pilots didn't make any distress calls,小题7: no debris 碎片) was found in the area 小题8:______ the flight last made contact.
Besides,airplane crashes小题9:________ (typical)occur during takeoff or landing. Only 9 percent of fatal accidents happen 小题10: ______ a plane is at cruising(平稳行进的)altitude,according to a report by Boeing in August.