问题 问答题 简答题

试述C210型磁电机向发动机上的安装方法?

答案

参考答案:

(1)中立位置控制阀处于中立位置时,同时油封垫圈也将进油缺口与进油室隔开。此时,排油室与回油室都被封闭。液压油泵空转,液压油缸内的油液既不增加也不减少,农具保持原来的位置上。

(2)进油位置(农具提升)当控制阀自中立位置前移1.5mm以后,控制阀的进油缺口开始与进油室相通,油液从后桥壳体内经滤清器,通过进油缺口进入进油室。液压油泵开始泵油,高压油经过高压油管进入液压油缸;推动活塞移动,通过悬挂机构来提升农具。

(3)快速回油位置(农具快降)当控制阀自中立位置后移到阀上的限位挡环与中间油封垫圈相碰的极限位置时,控制阀前端的四个回油缺口全部与回油室相通,液压油缸内油液在农具重量作用下,从控制阀四个回油缺口快速流回后桥壳体,农具便快速下降。

(4)慢速回油位置(农具慢降)当控制阀从快速回油位置前移5—6mm,控制阀上两个短宽回油缺口与回油室隔开,两个窄而长回油缺口仅有一小部分与回油室相通,液压油缸内的油液在农具重量作用下,因流通截面小,只能以细小流束流回后桥壳,农具便缓慢下降。快、慢速回油是两个区域,快中有慢,慢中有快,是“无极”变速,可根据作业的需要来进行选择。

选择题
单项选择题

Home prices slid in November, raising questions about whether the housing recovery is robust enough to maintain a sustained turnaround. From October to November, home prices fell 0.2% after (1) 0.1% in October, according to a report Tuesday by Standard & Poor’s/Case-Shiller’s home price index. (2) five of the 20 metro areas (3) by the index saw price increases for the month.

On a(n) (4) basis, prices were 5.3% lower in November than in November 2008. Prices were the same as in late 2003. "What we’ve seen (5) the past couple of months is that the pace of (6) has fallen down," says Maureen Maitland of Standard & Poor’s. "Some markets have (7) Is that because we haven’t (8) the foreclosure (回赎权的取消) cycle Because of unemployment We’re not seeing the (9) we were seeing in the last summer months. "

Metro areas that have seen a retreat in home prices (10) Seattle, Charlotte, Las Vegas and Tampa. All four (11) gains they made in recent months (12) . (13) , for the 20-metro index, the annual rate of decline is improving. That (14) , with other recent housing reports that show prices (15) or accelerating, could point to (16) the housing market is starting to (17) its footing, some economists say. Existing home sale prices were $178 300 in December, which is 1.5% higher than December 2008, according to a report this week by the National Association of Realtors. That was the first year-over-year (18) in median price since August 2007.

"The most (19) thing we can say is not only the market is stabilizing, but we’ve seen that housing demand is p," says Bernard Baumohl, with the Economic Outlook Group. "Housing probably will continue to climb upwards through the summer, (20) it could slip a little as the tax credit expires. \

20()

A.so

B.although

C.hence

D.since