下列标识符哪些是合法的。()
A. $time
B. _date
C. 8sum
D. mux
在以下定义的标识符中,选择定义正确的一个标识符。()
A. 34net
B. a1-b1
C. a3_$_2
D. a*b_net
下列标识符中,_________是合法的标识符。()
A. Shift$0
B. 34net
C. wire
D. Not@Ack_0
Listen to the dialoge and select the best choices.The relationship between the two speakers is probably________.
A. teacher and student
B. seller and customer
C. old friends
D. old classmates