单项选择题 The fuel oil pressure and forced draught pressure should be matched to ensure good combustion with a full steady flameIn the sentence the word “match” means （）

单项选择题 For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.

单项选择题 As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.