生产现场和经常有人工作的场所应配备急救箱,存放急救用品,并应指定专人负责保管。
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语境这一概念最早由波兰人类学家B.Malinowski在1923年提出来的。他将语境分为哪两类?()
A. 情景语境
B. 人文语境
C. 文化语境
D. 隐含语境
M7120型磨床的控制电路,当具备可靠的()后,才允许启动砂轮和液压系统,以保证安全。
A. 交流电压
B. 直流电压
C. 冷却泵获电
D. 交流电流
东风4B型内燃机车电空接触器主要由主触头及()、辅助触头、电空驱动装置等部件组成。
Which of the following statements about variables and their scopes are true? ()
A. Instance variables are member variables of a class.
B. Instance variables are declared with the static keyword.
C. Local variables defined inside a method are created when the method is executed.
D. Local variables must be initialized before they are used.