Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.
A. The direction of pressure on the journal in four-stroke engine is continuously
B. positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C. four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D. Low-stroke engines usually consume less lube oil than four-stroke engine
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律师进行业务活动的前提根据是（）
A. 国家授权
B. 当事人的委托
C. 律师事务所的委托
D. 司法行政机关的决定
目前冶炼过程中用得最多的造渣方法是（）。
A. 单渣法
B. 双渣法
C. 留渣法
张先生是一家啤酒厂的品酒师，其每年的奖金都高居酒厂第一位，而其平时的工资并不高，每月仅有3000元。预计2010年底，其奖金为30万元。张先生的个人所得税纳税情况如下：每月工资应纳个人所得税税额＝（3000-2000）×10％-25=75（元）请为张先生进行年终奖金的个人所得税筹划。
A system administrator will be migrating a server from AIX 5.1 to AIX 5.2 and is uncertain if the application running on the server will function properly after the migration. What is the fastest way to return to the previous AIX level if the application does not work？（）
A. Use base media to restore system to AIX 5.1.
B. Use an alt_disk_install and boot back to the AIX 5.1 rootvg.
C. Make a mksysb of the original AIX to restore back to the AIX 5.1 level.
D. Perform the AIX 5.2 upgrade using update_all with the commit option and reject filesets to return to AIX 5.1.
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