铝合金门窗安装施工时,推拉门窗扇开关力不应大于( )。
A.250N B.200NC.150N D.100N
参考答案:D
Is it with its charming scenery and a unique culture ________ Lugu Lake
impresses people from all over the world?
A.that
B.which
C.where
D.why
下列分子中,所有原子的最外层均为8电子结构的是( )
A.BeCl2
B.H2S
C.NCl3
D.SF3