题目内容

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

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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

either【C4】______foot in the centre of a town,

A. on
B. by
C. under
D. with

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