A.0→初应力→102%σcon(持荷2min)→95%σcon→σcon
B.0→初应力→102%σcon(持荷2min)→90%σcon→σcon
C.0→初应力→105%σcon(持荷2min)→90%σcon→σcon
D.0→初应力→105%σcon(持荷2min)→95%σcon→σcon
It is known that solar power can ______ electric energy.
A.convert into
B.convert to
C.be converted into
D.be converted to
In Henry's experiment,the galvanometer indicated a voltage when______.
A. the coil was connected to a battery
B. the coil was disconnected to a battery
C. neither A nor B
D. both A and B
It’s a good idea. We’ll discuss the details of ________.
A. its plan
B.our scheme
C.their conspiracy
D.our cooperation
废水中来源于有机物中的氨基,胺基,脲基,尿酸,含氮化合物等的硝化反应形成水中的是()。
A.氨氮
B.氮氧化物
C.COD