在催化剂注入泵出口注入稀释用的轻柴油，轻柴油与钝化剂比例是按（）考虑。 A.1：1

高架绝缘斗臂车如何保管？

---Would you please tell me _________? 

--- In a small village near Niingbo.

A．where was your mother born

B．where your mother was born

C．when was your mother born

D．when your mother was born

多食肥甘厚味，易（）。

A.生痰

B.化热

C.眩晕

D.胸痹

E.夜盲

黄土高原是我国水土流失严重的地区，分析黄土高原产生水土流失的自然原因（4分）

有下列二叉树，对此二叉树前序遍历的结果为( )。

A．XZCYAB

B．XYZABC

C．XYABCZ

D．XYAZBC