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问题 单项选择题

政府采购合同履行中，采购人需追加合同标的相同的货物、工程或者服务的，在不改变原合同其他条款的前提下，可以与供应商协商签订补充合同，追加与合同标的相同的货物、工程或服务，所有补充合同的累积增加的、采购金额不得超过原合同采购金额的( )。

A．10%
B．15%
C．20%
D．25%

答案

参考答案：A

填空题

sin（-1071°）sin99°+sin（-171°）sin（-261°）+tan（-1089°）tan（-540°）=______．
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问答题

Directions: Translate the following passage into Chinese.
To make your first encounter a positive one, start with a firm handshake. If the interviewer doesn’t initiate the gesture, offer your hand first. Whenever you .have a choice of seats, select a chair beside his or her desk, as opposed to one across from it. That way there are no barriers between the two of you and the effect is somewhat less confrontational. If you must sit facing the desk, shift your chair slightly as you sit down, or angle your body in the chair so you’re not directly in front of your interviewer.
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