如图所示,在调节平衡后的杠杆两侧,分别挂上相同规格的钩码,杠杆处于平衡状态.如果两侧各去掉一个钩码,则
A.左端下降
B.右端下降
C.仍然平衡
D.无法判断
答案:A
—What a smart and hard-working boy he is!
—Right. ________ a possibility that he will win the first place in the competition.
A.This is
B.It remains
C.There seems
D.That appears
手提式干粉灭火器的喷射距离米,灭火面积0.8-2.5㎡。()
A.1-2
B.2-5
C.5-7
D.7-8