当通过地滑轮的电缆角度为（）时，地滑轮承受的拉力是电缆所受拉力的倍。
参考答案：90°；1.414
— How is the man injured in the earthquake?
— The doctor said if ________ in a proper way, he was likely to be saved.[ ]
A. treated
B. treating
C. is treated
D. to be treated
为了判断碎屑岩的胶结物，经常使用浓度为（）%的盐酸来鉴别是否为灰质胶结。
A.0.5
B.2
C.5
D.10
