In production, the main sowing methods are (). A: A.broadcast B: B.drill sowing C: C.hole sowing D: D.precision sowing

The English phrase “sowing the dragon’s teeth” means one is sowing the trouble and conflicts。 （ ）

在双向链表中删除指针p所指的结点(pre和next，是结点的指针域，pre指向结点的前驱，next指向结点的后继)，则需要执行( )。 A: p↑．next：=p↑．pre；p↑．pre：=p； B: p↑．next↑．pre：=p↑．pre；p↑．pre↑．next：=p； C: p↑．pre：=p↑．next；p↑．next=p↑．pre； D: p↑．pre↑．next：=p↑．next；p↑．next↑．pre：=p↑．pre；

The pre-sowing low temperature treatment of seeds is known as . A: scarification B: electrophoresis C: vernalizaion D: abscission

〈center〉…〈/center〉是 标记 而〈pre〉…〈/pre〉是 标记。

Those who survived began sowing in the__________.

Sowing plough has only two feet.

‎The basis for determining the suitable sowing date for winter wheat is ( ) and cultivars development characteristics.‍ A: Sowing amount B: Yield level C: Accumulated temperature before winter D: Rainfall

‏The basis for determining the appropriate sowing date of winter wheat is ( ) and the characteristics of variety development.‏ A: Sowing rate B: Yield level C: Accumulated temperature before winter D: Rainfall

在循环双链表的p所指结点之后插入s结点的操作是（ ） A: p->next=s; s->pre=p; p->next->pre=s; s->next=p->next; B: p->next=s; p->next->pre=s; s->pre=p; s->next=p->next; C: s->pre=p; s->next=p->next; p->next->pre=s; p->next=s; D: s->pre=p; s->next=p->next; p->next=s; p->next->pre=s;