在页式存储管理系统中选择页面的大小,需要考虑的因素是 I .页面大的好处是页表较小; II .页面小的好处是可以减少由内碎片引起的内存浪费; III .通常,影响磁盘访问时间的主要因素不在于页面的大小,所以使用优先考虑较大的页面。
A.
Ⅰ、Ⅲ
B.
Ⅱ、Ⅲ
C.
Ⅰ、Ⅱ
D.
Ⅰ、Ⅱ、Ⅲ
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【单选题】Which of the following statements about the lipid composition of plasma membrane is wrong?
A.
Cholesterol is prominent in plasma membranes but barely detectable in mitochondrial membranes. Cardiolipin is a major component of the inner mitochondrial membrane but not of the plasma membrane.
B.
Phosphatidylserine, phosphatidylinositol, and phosphatidylglycerol are relatively minor components of most membranes but serve critical functions; phosphatidylinositol and its derivatives, for example, are important in signal transductions triggered by hormones.
C.
Sphingolipids, phosphatidylcholine, and phosphatidylethanolamine are present in most membranes but in varying proportions.
D.
Glycolipids, which are major components of the chloroplast membranes of plants, are also found in animal cells.