危险化学品安全技术
工作人员进入设备前,必须进行氧含量的监测,氧含量低于( )时,严禁入内,以免造成缺氧窒息事故。
A.17%
B.18%
C.20%
D.21%
参考答案:B
—____________?
—It was sunny and windy.
A. What was the weather
B.What was the weather like
C. How was the temperature
D.What was the temperature
女,36岁。平素身体健康,2周前腹痛腹泻时验尿有白细胞20个/HP,红细胞3个/HP,诊断为泌尿系感染,考虑其感染途径可能为()
A.邻近脏器直接感染引起
B.通过淋巴管感染
C.血行性感染
D.上行性感染
E.尿路梗阻反流引起感染