英译汉：“Issuing date；Valid period；warranty period”，正确的翻译为( )。

A:签发日期；保质日期；有效期限 B:签发日期；有效期限；保质期 C:有效期限；签发日期；保质日期 D:检验日期；签发日期；保持期

汉译英：“即期汇票；有效期限”，正确翻译为( )。

A:sight draft；valid period B:valid period；sight draft C:sight L/C；signature D:signature；sight L/C

汉译英：“原产地，有效期限”，正确的翻译为( )。

A:place of issue; Departure time B:place of origin; Departure time C:place of issue; Valid period D:place of origin; Valid period

In a computer，which of the following is the longest period? （）

A:Beat period B:Machine period C:Instruction period D:CPU period

There are several periods in a computer, the longest period is

A:Instruction period B:Machine period C:Beat period D:CPU period

There are several periods in a computer, the longest period is ( ).

A:instruction period B:machine period C:beat period D:CPU period

There are several periods in a computer, the shortest period is( ).

A:instruction period B:machine period C:beat period D:CPU period

In a computer, which of the following is the longest period ？（）

A:Beat period B:Machine period C:Instruction period D:CPU period