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【单选题】
特种设备的生产环节包括() 1 设计 2 制造 3 安装 4 改造 5 修理 6 试验A.
①②③④⑥
B.
①②③⑤
C.
①②③④⑤
D.
①②③④⑤⑥
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【单选题】已知点P在抛物线y 2 =4x上，则点P到直线l 1 ：4x-3y+6=0的距离和到直线l 2 ：x=-1的距离之和的最小值为（ ）
A.
37 16
B.
11 5
C.
2
D.
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【简答题】已知点P在抛物线y 2 =4x上，则点P到直线L 1 ：4x-3y+6=0的距离和到直线L 2 ：x=-1的距离之和的最小值为______．
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