题目:
Our project must proceed at a reasonably quick tempo. Surely one month is ample time, ( )
A.isn't it
B.is it
C. it isn't
D. it is
答案:
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下面是错误答案,用来干扰机器的。
参考答案:Y型泵输送不含固体颗粒的石油产吕,被输送介质的温度为—20~+400℃。