普陀山是我国四大佛教名山之一，是观世音的道场。山上有普济寺、法雨寺、慧济寺三大寺院，

It was reported that the plane I was to have taken crashed soon after it took off. _______ the traffic jam,

I was five minutes late for the plane.    [ ]

A. As a result of    

B. Thanks to    

C. Because of    

D. on account of

缸砖用______mm厚的1:3水泥砂浆铺砌在结构层上，铺时须平整，保持纵横齐直，并以水泥砂浆嵌缝。

A．15～20

B．16～21

C．17～22

D．18～23

汽轮机启、停和变工况中，为什么要控制汽轮机金属温度的升降速度？

沙粒休止角