题目内容

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

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— 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

Petercome with us tonight, but he isn’t very sure yet.mustB．myC．cnD．Will217. Petercome with us tonight, but he isn’t very sure yet.must B．my C．cn D．Will

A. must
B. may
C. can
D. Will