【单选题】The route of transmission of measles is
B.
digestive tract transmission
C.
transmission of airborne droplets
D.
transmission by skin contact
E.
insect-borne transmission
【单选题】电压继电器是根据电压信号而动作,有欠电压继电器和过电压继电器两种。一般怎样连接于电路中?
【多选题】属于《企业内部控制基本规范》第四条规定的企业建立与实施内部控制的原则有()
【简答题】电压继电器有过电压和欠电压两种。一般都采用电磁式,与电流继电器不同之处在于,电压继电器的()且()。
【单选题】Which of the following transmission line can be considered as a medium transmission line?
A.
Transmission line of length up to 600 km
B.
Transmission line of length up to 500 km
C.
Transmission line of length up to 200 km
D.
Transmission line of length up to 80 km
【简答题】Both mother-to-child transmission and partner-to-partner transmission can be pred or protected effectively by drugs for ______.
【判断题】常用电压继电器有过电压继电器和欠电压继电器两种。
【单选题】 Synchronized transmission is compared with asynchronous transmission ().
A.
Synchronized transmission saves more lines
B.
Synchronized transmission has higher data transmission rate
C.
Synchronization performance of synchronous transmission is better than that of asynchronous transmission.
D.
None of the above is right.
【单选题】电压继电器有欠压和过压继电器两种,欠压继电器吸合电压动作范围为()