商品煤质量验收时,对于原煤(St,d A.-0.17 B.0.17 C.0.56 D 发布时间:2018-03-05 09:30 │ 来源:www.tikuol.com 题型:单项选择题 问题: 商品煤质量验收时,对于原煤(St,d<1.00%)的全硫允许差为()。A.-0.17B.0.17C.0.56D.-0.56
题型:单项选择题 We have math ________ Friday. It's difficult ________ interesting.[ ]A. on, orB. on, andC. in, orD. in, and 查看答案