There are also problems in implementing time-period tariff such as narrow range of price difference, long demarcation of time period, lack of flexibility and limited scope of implementation.

Insofar as it did, it was because tariffs were a form of tax increase - but in that case you should be focusing on the whole range of fiscal actions, not just the tariff hikes.

After this, EU sued China for dumping frequently, the quantity is becoming large and the product range is expanding, the Antidumping tariff rate is rising.