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【单选题】
指令 twait 2 表示的等待时间是多少( )? 参考AS语言手册,6.5 程序控制命令里的相关指令说明。A.
2秒
B.
0.2秒
C.
这是等待信号的指令，如果信号没来，等待时间无限长
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