To our relief, some laws and regulations ___________ to punish those who drive after drinking alcohol.

A．have worked out

B．worked out

C．have been worked out

D．were worked out

鼠笼式异步电动机的起动方法有（）

A、直接起动

B、自耦变压器降压起动

C、星一三角形换接起动以及沿边三角形起动

D、转子回路串入电阻的起动