泥石流的防治措施应着重于防,以防为主,防治结合的综合治理方针。
参考答案:对
—What are you thinking about?
—I'm thinking about _____ to go for a picnic. [ ]
A. what
B. whether
C. that
D. if
蛤粉炒阿胶时多用的火力是()
A.中火
B.文火
C.武火
D.先文火后武火
E.先武火后文火