对于非承重模板,混凝土强度应达到()以上,其表面和棱角不应拆模而损坏方可拆除。
A. l.5MPa
B. 2.5MPa
C. 3.5MPa
D. 5.0MPa
that may happen in the【C13】______world.
A. future
B. modern
C. real
D. whole
And【C11】______do we call when there is an emergency
A. how
B. where
C. what
D. who
stop【C6】______motorists and help when there is an accident.
A. resting
B. tired
C. speeding
D. drunken