下列哪个理论是护理学的基本理论依据
A．人类基本需要理论B．系统论C．成长与发展理论D．应激与适应理论E．控制论
参考答案：B
Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.
A．what is called
B．which is called
C．what it is called
D．which it is called
从业人员进入危险货物作业现场，开启仓库、集装箱和封闭式车厢时要先____，以保障作业安全。
A.搬运
B.装卸
C.通风排气
