王大伯用300千克小麦磨出258千克面粉．求小麦的出粉率．
258300×100%=86%，
答：小麦的出粉率86%．
— Ann is in hospital.
— Oh ,really? I ______ know. I ______ go and visit her.[ ]
A. didn't, am going to
B. don't , would
C. don't, will
D. didn't, will
单相串激电机的优点是（）
A、启动力矩大
B、过载能力强
C、转速高
D、体积小
