E．mulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are or if ally soldered joints exit.

A．chromed

B．welded

C．galvanized

D．bolted

[单选题]Emulsion oils and sodium nitrite are both approved additives, but （） cannot be used if any pipes are galvanized or if soldered joints exist.A . the latterB . latterC . formerD . the former

[单选题]（） fuel oils （） lubricating oils require treatment before passing to the engine.A . Both；andB . Neither；norC . Either；orD . Both；or

[名词解释] 乳剂（emulsion）

[单选题]The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.A . has kept pace withB . has kept pace toC . has made pace withD . has made pace to

[单选题]The emulsion of the oil is mainly caused by （）.A . the solid impurities of large particleB . the solid impurities of fine particleC . the water contentD . both water and solid impuritie

[单选题]The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the ____.A．American PetroleumB．Institute number viscosity index numberC．Seconds Saybolt Furol numberD．Seconds Saybolt Universal number

[名词解释] 钠热阱 sodium hot trap

[名词解释] 钠冷阱 sodium cold trap

[问答题] 碱化度ESP（Exchangeable sodium percentage）

[单选题]Phenytoin Sodium的化学名为（ ）。