原水中有机物多以及输配水管线较长时，宜采用（）消毒。
A、液氯
B、氯胺
C、漂白粉
D、次氯酸钠
参考答案：B
5．Chang Xiufeng, known as China’s “Van Gogh Granny”, uses her tools to vividly_______old memories and bright gold autumn scene.
---That’s OK, but don’t forget next time.
A．present
B．process
C．prohibit
D．Predict
物料提升机在紧急、特殊情况下可以准许人员乘吊篮、吊笼上下。( )
