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【单选题】
The passage suggests which of the following about the workers who took temporary jobs during the 1980s?A.
Their jobs frequently led to permanent positions within firms.
B.
They constituted a less demographically diverse group than has been suggested.
C.
They were occasionally involved in actions organized by labor unions.
D.
Their pay declined during the decade in comparison with the pay of permanent employees.
E.
They did not necessarily prefer temporary employment to permanent employment .
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【简答题】如何确定无效合同。
【单选题】托收是出口人委托并通过银行收取货款的一种支付方式，在托收方式下，使用的汇票是 ( )。
A.
商业汇票，属于商业信用
B.
银行汇票，属于银行信用
C.
商业汇票，属于银行信用
D.
银行汇票，属于商业信用
【简答题】无效合同如何确定工程款？如果双方已经结算，是否以结算单为依据？如未经结算，又如何确定工程款数量？