The emulsion of the oil is mainly caused by （）.

[名词解释] 乳剂（emulsion）

[单选题]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．chromedB．weldedC．galvanizedD．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]The accident was caused by ______.A． the driver of the first carB． the driver of the second carC． the driver of the third carD． both B and C

[单选题]In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.A . a service tankB . a collecting tankC . a sumpD . a settling tank

[单选题]The quality of the fuel oil and lube oil （）, Im afraid.A . has much to do with the operation of the engine and its lifeB . have much to do with the operation of the engine and its lifeC . has much doing with the operation of the engine and its lifeD

[单选题]The forest fire caused by the volcano is difficult to be______.A． put offB． put onC． put outD． put up

[单选题]A．n error can be caused by attempting to divide by 0．A．InterruptB．DefaultC．UnderflowD．Overflow

[单选题]The driver who caused the accident ______.A． drove very, very fastB． killed another driverC． killed himselfD． both A and C

[单选题]:An error can be caused by attempting to divide by0．A．InterruptB．DefaultC．UndertowD．Overflow