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【多选题】
随机试验的特点有 （ ）A.
在相同条件下试验可以重复进行
B.
每次试验的可能结果不止一个，但在试验之前明确知道可能会出现的所有结果
C.
每次试验将会出现什么结果是无法预知的
D.
每次试验将会出现什么结果是完全可以预知的
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举一反三
【简答题】树形结构目录
【单选题】甲烷和氯气按物质的量之比为1:2混合,在光照下反应,得到的产物 为
A.
一氯甲烷与二氯甲烷的混合物
B.
只有二氯甲烷与氯化氢
C.
一氯甲烷、二氯甲烷、三氯甲烷的混合物
D.
一氯甲烷、二氯甲烷、三氯甲烷与四氯甲烷的混合物
【单选题】- My mother has been ill for several days. - ______.
A.
That’s too bad
B.
How terrible
C.
I'm sorry to hear that
D.
Never mind
【简答题】阅读理解。 Never give up Since I was young, my mother has always spent lots of time sitting be-hind a sewing machine (缝纫机) with a happy look on her face. For all the three kids in our family, she has made ...
【单选题】Because of the bad weather, my mother ____ and lay in bed. She ______ for a week.
A.
has been ill; was ill
B.
fell ill; has fallen ill
C.
fell ill; has been ill
D.
fell ill; is ill
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