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【单选题】
已知直线l上有2个点A，B，点P是直线l外一点，PA=1cm，PB=2cm，有下列说法： ①点P到直线l的距离等于1cm；②根据垂线段最短，可以判定PA⊥l；③过点P只能画一条直线与l平行． 这些说法正确的有（ ）A.
0个
B.
1个
C.
2个
D.
3个
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反馈参考答案：
举一反三
【单选题】成年人P-R间期正常值为 ( )
A.
0.05~0.20s
B.
0.12~0.20s
C.
0.08~0.20s
D.
0.09~0.22s
E.
0.15~0.25s
【单选题】The author suggested that people should eat more fruits, vegetables, and plant-based foods, eat less high-fat, high-calorie foods with insufficient nutritional value, stop smoking, exercise often and ...
A.
Y
B.
N
C.
NG
【单选题】成年人P-R间期正常值为( )
A.
0.11～0.20s
B.
0.12～0.20s
C.
0.08～0.20s
D.
0.09～0.22s
E.
0.10～0.20s
【单选题】Reforestation is forbidden in order not to reduce erosion and sediments in the rivers in some areas, otherwise 'dam-pond system' may have to be stopped.
A.
Y
B.
N
C.
NG
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