What time for room service will the crab serve a snack to Mr. Bellow?
A. 8:45
B. 9:00
C. 9:15
D. 9:30
查看答案
The waiter served a wrong dish, because the guest ordered the steamed Chinese green crab.
A. 对
B. 错
下列哪种说法指“免费”
A. free of charge
B. in the house
C. on the house
D. complimentary
s7-200PLC中,下列指令中无操作数的指令是() 。
A. LD
B. A
C. OLD
D. O
PLC可以采用语句表编程方式,指令OLD表示触点哪种连接关系()。
A. 串联连接
B. 并联连接
C. 回路串联连接
D. 回路并联连接