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【单选题】
混凝土弹性模量的基本测定方法是 ( )A.
在很小的应力(ac≤0.3f c )下做重复加卸载试验测得
B.
在很大的应力(dc>0.5 f c ))下做重复加卸载试验测得
C.
应力在0~0.5 f c 之间重复加载10次,取 时所测得的变形值作为确定混凝土弹性模量的依据
D.
应力在0~0.5 f c )之间加载一次即测
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【多选题】五四运动中,学生们提出的中心口号是( )。
A.
“外争主权、内除国贼”
B.
“拒绝和约签 字”
C.
“取消二十一条”
D.
“诛卖国贼 曹汝霖、章宗祥、陆宗舆”
E.
“停止内战，一致抗日”
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