折点加氯
参考答案：
从折点加氯的曲线看，到达峰点H时，余氯最高，但这是化合性余氯而非自由性余氯，到达折点时，余氯最低。
It is in Huizhou ______ you’re going to pay a visit to ______ this kind of TCL TV set is produced.
A．that; which
B．where; that
C．/; where
D．/ ; that
