关于盐酸吗啡,下列说法不正确的是()
A天然产物
B白色,有丝光的结晶或结晶性粉末
C水溶液呈碱性
D易氧化
E有成瘾性
参考答案:B
An analyst does research about return and risk. Given no major change in asset risk characteristics, will a decrease in the willingness of investors to accept risk typically result in an increase in:()
A.A
B.B
C.C
施工现场配电箱应装设电器设备是()
A、隔离开关
B、漏电断路器
C、电流表
D、热继电器