900是______个百,50是______个十.
900是 9个百,50是5个十;
故答案为:9,5.
(2010·全国Ⅰ,31)—Everybody is going to climb the mountain.Can I go too,mom?
—________ Wait till you are old enough,dear.
A.Will you?
B.Why not?
C.I hope so.
D.I'm afraid not.
用社对安全突发事件的分类中,以下哪一项不属于Ⅲ级安全事故突发事件?()
A.较大抢劫、盗窃事件
B.较大自然灾害事件
C.较大消防事件
D.一般安全性事件