⑴Whose sweater is it?____ A. No, it isn't.
⑵Look at my shirt.____ B. It's Mike's.
⑶Whose jeans are they?____ C. They're my father's.
⑷Is it Liu Tao's?____ D. My hand hurts.
⑸What's the matter?____ E. How nice!
某导体两端的电压为6伏,10秒内通过该导体横截面的电荷量为6库,通过该导体的电流为____ 安,这段时间内电流做功为 ____ 焦,该导体的电阻为 ____ 欧.
在下列方程中,关于x的分式方程的个数有( )个
①2x﹣3y=0;②x+12﹣3=2x7;③3x-2=5x;④x+1x-2+3;⑤2+1x2-x=6x2-1.
花粉是在花的哪个结构里产生的( )