焊料过少的危害是()
A.焊盘容易剥落
B.外观不佳,容易造成桥接现象
C.机械强度不足
D.强度低,导电性不好
参考答案:C
When they went into the park, they saw someone ______ Chinese Kongfu.
A.plays
B.played
C.to play
D.playing
在买方市场,多数货物的市场价格会不断上升。()