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【多选题】
下列关于江河水描述正确的是?A.
江河水自然条件影响，水中悬浮物和胶体杂质较多，浊度高于地下水，各地区江河水的温度相差很大。
B.
江河水的含盐量和硬度均较低。含盐量一般在50～500mg/L之间，硬度一般在15～150mg/L之间（以CaO计)，总的来说，河水含盐量和硬度一般均无碍于生活饮用。
C.
江河水的最大缺点是受工业废水、生活污水及其他各种人为因素污染，有害物质极易归入水体，因而水的色、臭、味变化多端，水的卫生安全性较差，水温不稳定，夏季不能满足工业冷却用水的要求。
D.
除黄河流域外，凡是土质、植被和气候条件较好的地区大部分河流浊度均较低，一年中大部分时间内河水较清，只是在雨季河水浊度较浑，一般平均浑浊度在50～400mg/L之间。
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举一反三
【单选题】Why have so few books for children ages ten and younger won Newbery awards?
A.
Judges tend to choose books for older children that address real-life problems.
B.
Authors include more illustrations in books for younger children.
C.
Publishers heavily advertise books written for older children.
D.
Marketers limit the number of books produced for younger children.
【单选题】What is implied by 'the younger ones are surrounded by more children's language on average than the older kids' (Para. 3) ?
A.
Younger children need parental rather than siblings' attentioa
B.
Younger children need siblings' rather than parental attention.
C.
Younger children feel uncomfortable with more siblings.
D.
Younger children have less chance to talk with their parents.
【单选题】自络挡车工交接班要做到“一提前、三检查、一彻底”其中检查是指检查机械状态、检查工作地面、检查作业车等处是否有回丝、纱管、纱它等，另外要重点检查（）。
A.
纱筒质量问题
B.
准备工作
C.
车档卫生
D.
机台清洁工作
【简答题】下列________情况下,船舶不应当将船舶签证簿交回船籍港海事管理机构注销。
【单选题】Play, often ______ as an activity for younger children, is still important in the social development of teenagers.
A.
to see
B.
seeing
C.
seen
D.
to be seen
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