
废气涡轮增压器转子两端轴承一般采用(),由自带油泵进行润滑。
A.机油 B.透平油 C.柴油 D.高级润滑油


A.机油 B.透平油 C.柴油 D.高级润滑油
相关分析可以表明变量间相关关系的性质和程度,只有当变量间存在一定程度的相关关系时,进行回归分析去寻求相关的具体数学形式才有实际意义
Every student needs a place to study. Some students like to study
in the quiet atmosphere of a library. Most school libraries have large
study tables with many chairs. They also have individual study booths
called carrels. A carrel is a small table with "walls" around three sides. A carrel is for one person, so there is only one chair at each carrel.
Other students prefer to study in their own rooms at home or in a dormitory.
In their rooms, these students have a desk, some bookshelves,
and perhaps a study lamp to provide good lighting.
All students need comfortable chairs because they spend many hours stting.
Students have different ideas about the best atmosphere for studying. Some students prefer one kind of lighting, one kind of table or desk, and one kind of chair. Other students prefer a different kind of lighting and furniture. Some students listen to music or study in groups. Other students need to be alone in a quiet room. In other words, there is not one best atmosphere for studying: There is a "best" atmosphere for each individual student.