跨度大于2m、小于8m的现浇混凝土板拆除时,混凝土强度应达到设计强度的( )。
A.50% B.75%C.80%D.100%
参考答案:B
I’ll never forget such a beautiful place _____ I spent my childhood there with my grandparents. [ ]
A. because
B. where
C. which
D. when
胶带输送机的驱动有单滚筒驱动和()滚筒驱动。
A、单
B、两
C、三
D、多