Aninstancemember()
A. isalsocalledastaticmember
B. isalwaysavariable
C. isneveramethod
D. belongstoasingleinstance,nottotheclassasawhole
E. alwaysrepresentsanoperation
I have my house cleaned once a week.()
Itisdesirablethatacertainmethodwithinacertainclasscanonlybeaccessedbyclassesthataredefinedwithinthesamepackageastheclassofthemethod.Howcansuchrestrictionsbeenforced?()
A. Markthemethodwiththekeywordpublic.
B. Markthemethodwiththekeywordprotected.
C. Markthemethodwiththekeywordprivate.
D. Markthemethodwiththekeywordpackage.
E. Donotmarkthemethodwithanyaccessibilitymodifiers.
ACEI类药物的作用机制有()。
A. 舒张血管,降低心脏后负荷及左室舒张末期压力,使心室容积缩小,室壁张力降低降低心肌耗氧量。
B. 改善侧枝循环,增加缺血心肌血流。
C. 清除氧自由基,防止脂质过氧化。
D. 减轻再灌注损伤,抑制血小板聚集,防止冠脉血栓形成。