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【单选题】
已知点M（-1，2）在直线2ax-by+2=0（a＞0，b＞0）上，则 4 a + 1 b 的最小值是（ ）A.
4
B.
6
C.
8
D.
9
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反馈参考答案：
举一反三
【简答题】砂轮的特性主要由磨料、()、硬度、组织()及形状尺寸等因素所决定。
【简答题】砂轮的特性主要由磨料、粒度、 、硬度和 组成。
【简答题】砂轮的特性主要由磨料、粒度、()、()、()及形状尺寸等因素所决定。
【简答题】砂轮的特性主要由：磨料、粒度、（）、硬度、组织、形状尺寸等因素决定。
【简答题】砂轮的特性主要由、、、和等因素决定。
【单选题】听力原文：M: I've just got back from the holiday you arranged for me, but I must tell you the hotel was really awful! It was miles from the sea. The food was awful too. The bedroom was dirty. W: Sorry abou...
A.
At the airport.
B.
In a travel agency.
C.
In a hotel.
D.
At home.
【单选题】听力原文：M: I've just got back from the holiday you arranged for me, but I must tell you the hotel was really awful! It was miles from the sea. The food was awful too. The bedroom was dirty. W: Sorry abou...
A.
At the airport.
B.
In a travel agency.
C.
In a hotel.
D.
At home.
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