下列气体中，既能用排水集气法收集，又能用向下排空气法收集的是
A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111153911261126.jpg" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111153951945194.jpg" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/2013011115390381381.jpg" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/2013011115390781781.jpg" alt="" border="0" />
