【简答题】七选五 There is an English saying:“ ___ 小题1: .__ .” Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body. ...
【单选题】Complaints should be made to a(an) ______ person, who will deal with your problem seriously.
【单选题】下列关于溶液的叙述正确的是( )
B.
饱和溶液一定是浓溶液,不饱和溶液一定是稀溶液
D.
一定温度下,物质的溶解度随溶剂的量的变化而变化
【单选题】有关溶液、溶质和溶剂的叙述正确的是
D.
水是一种非常常用的溶剂,因此任何溶液都是水作溶剂
【单选题】基本农田保护区划定的原则中,与国民经济及社会发展中长期计划和规划相适应,规划年限一般应在( )年以上。
【单选题】The underlined word' burnout' (Para. 5) here refers to the state of______.
A.
being seriously burnt in the skin.
B.
being unable to burn for lack of fuel
C.
being badly damaged by fire
D.
being unable to function because of excessive use
【多选题】使用逻辑“与”运算符可以达到的效果包括( )
【单选题】某溶液降低温度后有晶体析出,则原溶液( )
【简答题】下列有关溶液的说法不正确的是( ) A.溶液一定是均一、稳定的混合物 B.饱和溶液可能是稀溶液 C.饱和溶液析出晶体后溶质质量分数一定会变小 D.溶液中的溶剂只能是一种