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问题 选择题

过点（-1，3）且垂直于直线x-2y+3=0的直线方程为[ ]

A.2x+y-1=0

B.2x+y-5=0

C.x+2y-5=0

D.x-2y+7=0

答案

答案：A

选择题

对于0.1 mol/L的醋酸溶液，下列说法正确的是[ ]

A．加水稀释后，溶液中c(H+)和c(OH-)都减少

B．温度升高后，溶液的pH增大

C．加入少量Na2CO3固体，醋酸电离平衡向左移动

D．加入少量冰醋酸后，溶液的c(H+)增大

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选择题

        __, Mark Twain became worldwide famous at once.

A．The novel was brought out

B．The novel brought out

C．The novel was coming out

D．The novel came out
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