金叶女贞叶斑病的病原为真菌。( )
参考答案:对
He is to lift the heavy box. [ ]
A. too weak
B. very weak
C. weak enough
D. enough weak
抛八字锚时,当两锚链夹角为(),则两锚间距恰好等于链长。
A.30。
B.45。
C.60。
D.90。