是计算()的公式。
A.固定资产交付使用率
B.建设项目投产率
C.建设周期
D.建设工期
参考答案:C
After the explosion,the roads are full of ________people leaving the city.
A.afraid
B.frightened
C.frightening
D.scary
JT—800/630绞车的滚筒宽度是30厘米。