高级IO输出函数tone( )方法可实现对指定任意引脚频率的输出， 如需在8号引脚，持续输出3S时间的1200Hz频率，下面那条函数可实现？
A: tone(8,1200,3);
B: tone(8,3000,1200);
C: tone(8,1200,3000);
D: tone(8,2000,3000);
A: tone(8,1200,3);
B: tone(8,3000,1200);
C: tone(8,1200,3000);
D: tone(8,2000,3000);
举一反三
- Fill in the blanks according towhat you have learned in the video.Yes-no questions are often used in (1) ________ tone indicating uncertainty, but sometimes they are also used in (2) ________ tone. Besides uncertainty, rising tone indicates (3) ________ and (4) ________.Falling tone are often used in (5) ________ , 6) ordinary ________, indicating (7) ________ and (8) ________.
- Chinese is a ________language. English is an________ language. A: tone, intonation B: intonation, tone C: tone, tone D: intonation, intonation
- Chinese is a ________language. English is an________ language.? tone, tone|tone, intonation|intonation, intonation|intonation, tone
- In the example “ Wasn’t it great?”, what tone should be used at the end of the question? A: falling tone B: rising tone C: rising-falling tone D: falling - rising tone
- Which of the following is in a proper tone? A: Have your report on my desk by 8 am tomorrow at the latest. B: Please let me have your report by 8 am tomorrow.