风险识别可以判断风险是否存在；风险评价可以确定风险量大小；采用风险对策可以( )。
A．预防风险
B．转移风险
C．回避风险
D．对症处理
参考答案：D
补全对话(每空一词)。
A: Excuse me, __1__ is the way to the Children's Hospital?
B: __2__ , I don't know. You'd __3__ ask that policeman.
A: Excuse me, __4__ can I get to the Children's Hospital?
C: Oh, go along Huanghe Street, and __5__ the second turning on your left. Then __6__ No. 3 bus and
__7__ off __8__ the third stop. You'll see a white building __9__ the post office and the police station.
You __10__ miss it.
A: Thank you very much.
C: You are welcome.
小球从5m高处，向离小球4m远的竖直墙以8m/s的速度水平抛出，不计空气阻力，则：小球碰墙点离地面的高度为____ _
