搜题请搜索小程序“爱下问搜题”
问题 选择题

化学知识的合理利用可以治理污染，改善人类的生存环境。下列做法正确的是 [ ]

A．从海水中提取镁、溴、制备材料、药品

B．为提高作物产量，大量使用化肥

C．焚烧秸秆，使秸秆灰烬还田

D．工业提取时，用有机溶剂代替水溶剂

答案

答案：A

单项选择题

The nurse is providing postprocedure care for a client who underwent percutaneous
lithotripsy. In this procedure, an ultrasonic probe inserted through a nephrostomy tube into the renal pelvis generates ultra-high-frequency sound waves to shatter renal calculi. The nurse should instruct the client to

A. limit oral fluid intake for 1 to 2 weeks.
B. report the presence of fine, sandlike particles through the nephrostomy tube.
C. notify the physician about cloudy or foul-smelling urine.
D. report bright pink urine within 24 hours after the procedur
查看答案
选择题

若正项等差数列{an}和正项等比数列{bn}，且a1=b1，a2n﹣1=b2n﹣1，公差d＞0，则an与bn（n≧3）的大小关系是[ ]

A．an＜bn  

B．an≥bn  

C．an＞bn  

D．an≤bn
查看答案