单项选择题
Which modifier should be applied to a method for the lock of object "this" to be obtained prior to execution any of the method body? ()
单项选择题 “产品+利益”构成了饭店产品的“()策略”。
单项选择题 His hesitation ____ unwillingness.
单项选择题 ()是指在一定的经济技术水平下可以被利用的资源储量。
