耐久性幼虫?
参考答案:
松材线虫在病树枯死后或期间,此时3、4龄幼虫角质膜加厚,内含物增多,口针、食道退化,抗逆性增强,适应昆虫传播,所以被称为耐久性幼虫或休眠幼虫。
设置文件的()属性,意味着文件不能被更改或删除。
A.只读
B.存档
C.隐藏
D.系统
The hatch at the after end of the canopy in a lifeboat()the after lifting hook, painter, and tow line.
A.give access to
B.links up with
C.have contact with
D.is constructed of