经过低温法制取的氮气,不含有水分和其它有害杂质,可以用做仪表气源来保护仪控设备。
参考答案:对
Give your friends or family members a phone call and tell them your return time, or you will lose the chance of being found in case you get lost in the woods.
男,69岁,排尿困难2年,饮酒后不能排尿6小时,下腹憋涨难忍,检查:耻骨上膨隆,叩诊呈实音。
进一步配合治疗应选择()
A.局部放疗
B.全身静脉化疗
C.干扰素免疫治疗
D.经肾动脉化疗
E.中药治疗