航空煤油中,限制芳烃含量不超过20%,其原因是()
A、芳烃过多,会造成芳烃结晶
B、芳烃过多,易冒烟
C、芳烃过多,溶解水分增多,易造成冰点不合格.
参考答案:C
There are not _____________ trees on the road. [ ]
A. some
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C. no
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I like playing basketball _____ my friends. [ ]
A. to
B. for
C. with
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