【单选题】患儿王毛毛,18个月,首次肌内注射青霉素,下述操作过程正确的是
【单选题】患儿王毛毛,18个月,首次肌内注射青霉素,下述操作过程正确的是
【单选题】测定烟气流量和采集烟尘样品时,若测试现场空间位置有限、很难满足测试要求,应选择比较适宜的管段采样,但采样断面与弯头等的距离至少是烟道直径的( )倍,并应适当增加测点的数量。
【单选题】--- I’m sorry I ________ make it yesterday. I ________, but I was really busy. --- That’s fine. I know you are usually busy at this time of year.
A.
couldn’t, intended to have come
B.
didn’t, intended to have come
C.
couldn’t, intended to come
D.
didn’t, intended to come
【单选题】患儿王毛毛,18个月,首次肌内注射青霉素,下述操作过程正确的是
【单选题】测定烟气流量和采集烟尘样品时,若测试现场空间位置有限、很慢满足测试要求,应选择比较适宜的管段采样,但采样断面与弯头等阻力构件的距离至少是烟道直径的( )倍,并应适当增加测点的数量和采样频率。
【单选题】测定烟气流量和采集烟尘样品时,若测试现场空间位置有限、很难满足测试要求,应选择比较适宜的管段采样,但采样断面与弯头等的距离至少是烟道直径的()倍,并应适当增加测点的数量。