【单选题】关于现场总线,以下说法中错误的是_____。
A.
通过现场总线,只需一根通信电缆就可将分散的现场设备连接起来,完成对所有现场设备的监控;
B.
由于各种原因,目前为止并没有真正形成国际范围内的统一标准,因此现场总线的种类很多;
C.
CAN和ProfiBus是目前在船舶机舱应用较多的现场总线;
D.
RS-232、RS422和RS-485是常用的船用现场总线。
【单选题】She has devoted all her life_________ taking care of homeless people.
【单选题】All her time ___ experiments, she has no time for films. [ ]
【单选题】The determined mother has devoted all she has to ________ her son out of trouble.
【单选题】She has devoted all her energies _______ the care of homeless people.
【单选题】关于农民的能力与农业推广,下列说法不正确的是( )
B.
让善于沟通、协调及联络的农民在合作组织中负责技术工作
C.
确定推广项目和内容时要考虑农民的实际接受能力
D.
要加强对农民的教育引导,强化对农民的能力训练
【单选题】放射治疗的质量保证的英文缩写()质量保证的英文为QualityAssurance缩写为QA。
【单选题】All her time _______ experiments, she has no time for films.