He said he would arrive before seven, and______ .
A.he did
B.did he
C.he had
D.had he
答案:A
微波的生物学作用机制世界公认的学说是
A.非热效应
B.神经-内分泌功能紊乱
C.热效应
D.钙稳态紊乱
E.应激
接到通知办理自备铁路货车过轨的车辆部门技术检查如何规定?