约翰逊等人创立了系统安全管理理论和方法.
参考答案:对
---Do you know how her grandpa passed_____?
--- He died _____ illness.
A.off, from
B.out, from
C.away, for
D.away, of
太阳辐射、可见光、紫外光、红外光的能量太阳总辐射能量比例是多少?