我国与世界同纬度相近地区气温的比较，夏季较高，冬季较低，气温年较差较大。这说明
A：雨热同期
B：气候复杂多样
C：气候具有显著的大陆性特点
D：我国的气候不好
Situations
Differences
Britons (英国人)
Americans
When being knocked into
They will say “sorry” before the other does.
They will ____ the person and expect him to say “sorry”.
When going out for dinner
They will ____ when going out for dinner.
They may wear a normal shirt to go to a good____.
When taking a taxi
They will give an address to the taxi driver and then ____.
They will ____ the taxi driver all the time.
一台小型电动机在3V电压下工作，用此电动机提升所受重力为4N的物体时，通过它的电流是0.2A．在30s内可使该物体被匀速提升3m．若不计除电动机线圈生热之外的能量损失，求：
