炮泥太硬，开口机难钻，可适当增加炮泥中（）配比。
参考答案：焦粉
The leader of the factory told us that very little ______ was made of the waste material in the past.
A．cost
B．value
C．use
D．matter
我国印花税的纳税义务人仅限于在我国境内书立、领受有关凭证的单位和个人。 ( )
