有效射程大于迎头区的长度时,就能迅速排走炮烟
参考答案:对
Can you tell me your _____ of success?
There is no easy way to learn English well. Just work hard.[ ]
A. duty
B. trouble
C. secret
D. rule
款冬花的性状特征是()
A.呈长圆棒状,外面被有多数鱼鳞状苞片,撕开后可见白色茸毛
B.为黄色粉末
C.为不带子房的管状花
D.多皱缩呈条状,完整者长9~15cm
E.呈线性,三分枝