05mA= μA= A
A. 5/5×10-5
B. 5×102/5×10-3
C. 50/5×10-5
D. 5×103/5×10-5
— Will Peter come with us tonight — He ____ come ,but he isn’t very sure yet.
A. must
B. can
C. may
D. will
梨适宜在()温度下贮藏
A. 0-1℃
B. 10-15℃
C. 20-25℃
D. 25-30℃
在普通焊接5部法的焊盘预热步骤中,包含的操作有
A. 烙铁头清洁干净并上锡
B. 烙铁头给焊盘和管脚同时预热5秒
C. 烙铁头必须同时碰到焊盘和管脚
D. 烙铁头与焊盘成40±5度角