______ bananas and ______ yogurt do you need for your banana milk shake?

A．How many; how many

B． How much; how many

C． How many; how much

D．How much; how much

短路时，短时间内就会使导线产生大量的（），造成导线熔断或过热而引发火灾。

A、电压

B、有害气体

C、热量

D、电阻