玉米在()缺磷表现明显。
A、抽穗期
B、苗期
C、成熟期
D、花芽分化期
参考答案:B
With the ______ of making a fortune,many people went to Australia in the 19th century to wash sand
for gold. [ ]
A. task
B. intention
C. trade
D. appointment
环托式矫治器是谁设计研制的()。
A.Angle
B.Tweed
C.毛燮均
D.陈华
E.朱希涛