现场实测结构上挠值低于理论上挠值,主要原因有两个方面,一是(),二是实际混凝弹性模量高于规范值。
A.预应力张拉不合格
B.混凝土强度高
C.混凝土强度低
D.压浆不饱满
参考答案:A
— ____
— Sorry. She isn't at home now. [ ]
A. Are you Jim?
B. Do you know Linda?
C. May I speak to Linda?
D. Can I help you, Jim?
如图所示电路中,已知R1=8Ω,R2=4Ω,则电流表A1和A2的读数之比为()。
A.2:1
B.3:2
C.1:1
D.3:1