晶闸管导通角大于()时出现闪络,证明变压器一次抽头适当。
A. 10%;
B. 40%;
C. 60%;
D. 100%。
在采用单循环制的篮球比赛中,在名次排列时,遇到三个或三个以上球队的积分相等,而且他们之间比赛的胜负场数又是相同,则以积分相等球队相互之间的比赛的()来确定名次,得失分率高者名次列前。
An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT().
A. sound signal
B. light signal
C. visual signal
D. radiotelephone