[单选题]The energy stored in coal ______.
[单选题]New Coal Corp. (NCC) is a small company that claims to have a proprietary f
[单选题]A.s there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.A. primary B. alternative C. instant D. unique
[单选题]What is a by-product of burned coal?A. Aluminum, silicon, and magnetic.B. Paving material.C. Fly ash.D. Concrete additive.
[单选题]E.very few years, the coal workers ______ their lungs X-rayed to ensure their health.A. are havingB. haveC. have hadD. had had
[问答题] Reasons for the British coal mining is called a “sick” industry today.
[主观题]Some ________are on the bed.
[判断题] 煤成气(coal derived gas)是天然气。A . 正确B . 错误
[单选题]() are mounted on and bolted to the bed-plate cross girders.A . The crankshaftB . The crankcaseC . The guide-waysD . The frame
[问答题]It is well known that coal is an important source of energy.