After you learn about the lives of the pilots, especially their hard training, you can decide ______ you want to become a pilot or not.
A：if
B：how
C：why
D：whether
某台电动机两端电压为6V时，通过的电流为1A，其阻值为0.5Ω的线圈在5min内产生的热量是____ J；我们把这种电流通过导体产生热量的现象称为电流的____
根据课文的意思判断对错。
