在探究电流通过导体时产生热的多少与什么因素有关时,采用了如图所示的实验装置.这是用来探究电流通过电阻丝产生的热量与____ 的关系.
植物的无性生殖在农业上有广泛的应用,请据此分析回答下列问题.
A: Excuse me. Is there a ____ near here?
B: Yes, there is.
A: Where is it?
B: It's ____the science museum.
A: Is it____
B: No, it isn't. Go straight to the first crossing and then turn ____
A: OK. I'll ____there. Thanks.