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【单选题】
下列命题中，不正确的是（ ）A.
一个点到圆心的距离大于这个圆的半径，则这个点在圆外
B.
一条直线垂直于圆的半径，那么这条直线是圆的切线
C.
两个圆的圆心距等于它们的半径之和，则这两圆外切
D.
圆心到一条直线的距离小于这个圆的半径，则这条直线与圆有两个交点
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反馈参考答案：
举一反三
【简答题】建筑装饰工程特点是什么?
【单选题】Chitin is a homopolymer of N-acetyl-D-glucosamine units in ________ linkage. It is a primary component of cell walls in fungi, the exoskeletons of arthropods, such as crustaceans and insects, the radu...
A.
β( 1 ® 2)
B.
β(1→ 3)
C.
β(1→ 4)
D.
β(1→ 6)
【简答题】Traditionally, a sentence is seen as a sequence ofwords. The study of sentence formation, therefore, involves a great deal of thestudy of the word, such as the classification of words in terms of part...
【单选题】In terms of communicative function, how many sentence types are there in English?
A.
6
B.
5
C.
4
D.
3
【单选题】In terms of function, the sentence “ Water boils at 100 degrees Centigrade. ” is __________.
A.
performative
B.
interrogative
C.
social
D.
descriptive
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