函数，若＞0，＞0，则函数在区间内（）

题干

函数

，若

＞0，

＞0，则函数

在区间

内（）

A：一定有零点

B：一定没有零点

C：可能有两个零点

D：至多有一个零点

上一题下一题 0.0难度选择题更新时间:2018-11-21 11:27:25

C

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Summer vacation is coming. Most of students want to have a good trip this summer. Here is some information about trips for you.

Trip 1 The Stone Sea

Bring your strong shoes for hiking in the beautiful Stone Sea.You can find all different kinds of stones and wild flowers in the area.

Time:8:00am-6:00pm Tel:4325116

Adult: ￥80.00 Child: ￥20.00

Trip 2 The Pine Sea

This is a sea with a lot pines in Mount Wu.Take your digital camera and enjoy the great sights here. It is a good place to avoid summer heat.

Time:9:00am-3:00pm Tel:4258663

Adult: ￥120.00 Child: ￥60.00

Trip 3 The Big Vally

Take your swimming suits,and come for a night walk along the Big Vally.You can take hot spring and enjoy some folk music.

Time:10:00am-11:00pm Tel:4325611

Adult: ￥160.00 Child: ￥120.00

Under 12 years old for free

Trip 4 The Grass Lake

Wear your sun hats and enjoy wonderful sunshine.Of course,you can swim in the lake and take the boat to different islands for natural scenery.

Time:8:30am-8:00pm Tel:4325711

Adult: ￥60.00 Child: Free