【单选题】It was only by a Great effort of will and courage that he was able to ___ himself together.
【多选题】对某些中小城镇,在( )情况可考虑采用合流制。
A.
排水区域内有一处或多处水源充沛的水体,其流量和流速都足够大,一定量的混合污水排入后对水体造成的污染危害程度在允许的范围以内
B.
街坊和街道的建设比较完善,必须采用暗管渠排除雨水,而街道横断面又较窄,管渠的设置位置受到限制时,可考虑选用合流制
C.
地面有一定的坡度倾向水体,当水体高水位时,岸边不受淹没
【单选题】It was only by a great effort of will and courage that he was able to______himself together.
【单选题】It was only by a _________ effort of will and courage that he was able to pull himself together.
【判断题】女性阴道内的环境呈弱酸性, PH值在4到4.5之间。这种环境下,阴道具有自净自洁的作用。()