由于机械摩擦与撞击容易产生高热及火花,所以最好不采用斗式运输机运输粉尘。
参考答案:对
The figure below shows a record used for recording information about a named event. Which of the following statement is incorrect VAR r:record event:array[1..10] of char; place:array[1..20] of record plname:array[1..15] of char; date: array[1..5] of record mo:l..12; day:l..31; year:integer end end end;
A.This is a one-dimensional array of records, also called a tabl
B.This is so called record of arrays;
C.The event can occur in up to 20 places and on up to 5 different dates in each plac
D.A reference to placdatmo will access the month of the jth occurrence, in the ith place, of
同步电动机纵联差动保护的动作电流整定时应满足()条件。
A、躲过最大运行方式下,外部三相短路时的最大不平衡电流
B、躲过最小运行方式下,外部三相短路时的最大不平衡电流
C、躲过最大运行方式下,外部两相短路时的最大不平衡电流
D、躲过电动机启动时的不平衡电流