减少管线输差根本措施包括哪几个方面？
参考答案：减少输差的根本措施应包括防止管道泄漏和提高计量精度两个方面。
若商品的进货价降低8%，而售出价不变，那么利润（按进货价而定）可由目前的P%增加到（P+10）%。问P的值是（）
A．20
B．15
C．10
D．5
In his lecture, the professor referred to the belief, in contrast to all other countries, ______the elderly are wise, ______is particularly dominant in the Chinese culture．
A．that; one that
B．that; that
C．which, which
D．that; one
