甲类厂房与多层乙类仓库防火间距不应小于()m。
A.12.
B.10.
C.13
D.14
参考答案:A
--- Try this yellow shirt.
-- -____ . How about the red one?
-- -That's OK.
A.But I don't like the size
B.I like it very much
C.But I don't like the color
D.I'll take it
轻质弹簧原长10cm,在它下面挂一个所受重力为4N的物体处于静止时,弹簧长12cm,则错误的是( )
A.该弹簧的劲度系数k=200N/m
B.物体受到的合力大小为4N
C.弹簧受到的拉力大小为4N
D.物体受到的弹力大小为4N