在保护煤柱设计时,走向方向煤柱边界按()角圈定。
A.β
B.γ
C.δ
D.α
参考答案:C
--Are you satisfied with what she has done?
--Not a little. It can’t be______.
A.any worse
B.any better
C.so well
D.so bad
无因民事法律行为