有关系R和S，R∩S的运算等价于（）

A:S-（R-S） B:R-（R-S） C:（R-S）∪S D:R∪（R-S）

R1和R2电阻并联，等效电阻R是（）。

A:R1－R2 B:R1+R2 C:（R1+R2）/R1×R2 D:R1×R2/（R1+R2）

The new package of measures is inevitably a complicated one due to ______.

A:Europe's negotiators' loss of confidence B:European expenditure on farm support C:escape clauses for some European countries D:suspicion of the new package

汉译英“外包装；泡沫塑料；防锈包装”（）。

A:outer package；rustproof packaging；plastic foam B:outer package；plastic foam；rustproof packaging C:rustproof packaging；outer package；plastic foam D:plastic foam；rustproof packaging；outer package

汉译英：“防锈包装；外包装；泡沫塑料”，正确的翻译为( )。

A:plastic foam；rustproof packaging；outer package B:outer package；plastic foam；rustproof packaging C:rustproof packaging；outer package；plastic foam D:outer package；rustproof packaging；plastic foam

汉译英 “外包装；泡沫塑料；防锈包装”( )。

A:outer package; rustproof packaging；plastic foam B:outer package; plastic foam; rustproof packaging C:rustproof packaging; outer package; plastic foam D:plastic foam; rustproof packaging; outer package

有关系R和S，R∩S的运算等价于______。

A:S-(R-S) B:R-(R-S) C:(R-S)∪S D:R∪(R-S)