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【简答题】
如图，在Rt△ABC中，∠ABC=90°，∠ACB=30°，将△ABC绕点A按逆时针方向旋转15°后得到△AB 1 C 1 ，B 1 C 1 交AC于点D，如果AD= ，则△ABC的周长等于 .
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【简答题】What can be used to handle an oil spill?
【简答题】What can be used to clean up spilt oil in the of an oil spill?
【简答题】Crude oil must be and then can be used.
【单选题】Satellite tracking and remote communication systems can be used to
A.
reduce oil consumption.
B.
remove the obstacles on the road.
C.
call for help when one's car crashes.
D.
help drivers get out of a traffic jam.
【单选题】A lube oil filter can be used to remove most contaminants from lube oil. A contaminant which will remain in the lube oil after filtering is ____.
A.
acid
B.
fuel oil
C.
sediment
D.
water