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问题 判断题

柴油机排气阀在上止点后关闭是为了利用压差排气而减小活塞上行排气时的负功。

答案

参考答案：错

解析：柴油机排气阀在下止点前开启是为利用压差排气而减小活塞上行排气时的负功。

单项选择题

“It is declared that this shipment does not contain any wood packing materials．”与这句话意思接近的是( )。

A．We declare that no wood packing material was used in this shipment

B．No declaration was made whether wood packing materials had been used or not

C．If you don' t make any declaration，we will not use any wood packing material

D．We will not use any wood packing material since you have provided us a declaration of no-wood packing material
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单项选择题

承包商甲某与某建筑材料供应商签订了钢材购销合同，约定建材供应商向乙承包商、丙承包商交付钢材，但是，建材供应商却只向乙承包商履行，而没有向丙承包商履行，致使丙承包商因缺钢材而影响施工，造成经济损失，对此，建材供应商应向( )承包商承担违约责任。

A．丙

B．乙

C．甲

D．乙、丙
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