为检验D中的官能团,所用试剂包括NaOH水溶液及()
参考答案:HNO3、AgNO3
解析:
Britain has recently had a high level of unemployment, but the same is true _____ many other countries.[ ]
A. at
B. from
C. of
D. to
压力容器检验维修中,检验仪器和修理工具的电源电压超过( )V时,必须采用绝缘良好的软线和可靠的接地线。
A.36 B.24C.12 D.6