Which of the following is not one of the responsibilities of the Tariff Commission ( )

A．To formulate the guideline for drawing up the regulations

B．To set temporary tariff rates

C．To levy Customs tariffs on imports & exports

D．To examine the draft of the amendment to tariff

起动时点火提前角是固定的，一般为（）左右。

A、15°

B、10°

C、30°

D、20°