矿井使用的地质剖面图按其表示范围的大小可分为()、()和()、()。
参考答案:勘探线地质剖面图;采区地质剖面图;井筒;巷道地质剖面图
—Why ______ you _______ give such a talk?
—Well, I've applied for this job. They've asked all the applicants to give a talk as part of the selection
process. [ ]
A. don't; have to
B. had; had to
C. are; used to
D. have; got to
在丁型肝炎预防措施中,下列正确的是()
A.用敏感方法筛选供血员
B.提倡用志愿供血员
C.严格掌握输血适应证
D.不采用血液制品
E.使用丁型肝炎疫苗