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【判断题】
烷烃的通式是CnH2n+2 ,烯烃的通式是CnH2n。A.
正确
B.
错误
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举一反三
【单选题】Dry cargoes are those commodities that ___.
A.
never leak but may be spoiled by leakage
B.
sometimes leak and damage themselves
C.
often leak and damage other cargo
D.
neither leak nor will be damaged by leakage
【单选题】[7-58]Dry cargoes are those commodities that ___.干货是那些
A.
never leak but may be spoiled by leakage 不会泄漏但可能被渗漏物损害的货物
B.
sometimes leak and damage themselves 有时会泄漏并会损坏
C.
often leak and damage other cargo 经常泄漏并损坏其它货物
D.
neither leak nor will be damaged by leakage 不会泄漏并不会渗漏损害其它货物
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