皮皮学,免费搜题
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【简答题】
Teeth are important. Strong, healthy teeth help you chew foods that help you grow. They help you speak clearly. And they help you look your best. Here are some tips for you to take care of your teeth. 1. brush your teeth the right way. Brush you teeth at least twice a day--after breakfast and before bedtime. If you can, brush after lunch or after sweet snacks, too. Brush all of your teeth, not just the front ones. Spend time brushing teeth along the sides and back of your mouth. Brush away from your gums, too. Spend at least three minutes each time you brush. Play a song you like to help pass the time. Get a new toothbrush every three months. When you buy your toothbrush, be sure it has soft bristles.( ) 2. learn how to floss your teeth Flossing is a very important way to keep your teeth healthy. Food may hide in places where a toothbrush cannot get to, like the space between two teeth. Flossing can help get rid of it. Carefully move the floss between two teeth, up and down. You'll need to floss your teeth at least once a day. 3. have good eating habits You need to be careful about what you eat and drink. Eating sugar is a major cause of tooth decay( 腐败) . Eating sugar before you go to bed can make things even worse. Eat lots of fruit and vegetables and drink water instead of soda.
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【单选题】中间业务,是指银行不需要动用自己的资金而以中介人的身份代客户办理各种委托事项,并从中收取手续费的业务,以下不属于银行的中间业务的是( )。
A.
汇兑
B.
代理
C.
发行商业票据
D.
代客买卖
【单选题】如果已知 Ca 3 (PO 4 ) 2 的 K , 则在其饱和溶液中 , c (Ca 2+ )= :
A.
( K ) 1/5 mol·L -1
B.
( K ) 1/5 mol·L -1
C.
( K ) 1/5 mol·L -1
D.
( K ) 1/5 mol·L -1
【简答题】在△ABC中,BC=a,AC=b,AB=c,设c为最长边,当a 2 +b 2 =c 2 时,△ABC是直角三角形;当a 2 +b 2 ≠c 2 时,利用代数式a 2 +b 2 和c 2 的大小关系,探究△ABC的形状(按角分类). (1)当△ABC三边分别为6、8、9时,△ABC为______三角形;当△ABC三边分别为6、8、11时,△ABC为______三角形. (2)猜想,当a 2 +b 2...
【单选题】当a=3,b=1时,代数式 2a-b 2 的值是(  )
A.
3
B.
5 2
C.
2
D.
1
【多选题】创业过程呈现出如下特点
A.
创业过程充满风险与不确定性
B.
创业过程初期机会挖掘与选择是关键
C.
创业过程中关键要掌控平衡风险
D.
创业过程中的失败或许是今后成功的铺垫
【单选题】当a=2,b=1,c=3时,c 2 -(a-b) 2 等于 [     ]
A.
2
B.
0
C.
8
D.
12
【判断题】中间业务是指商业银行不需要动用自己的资金代替客户承办收付和其他委托事项而收取手续费的业务
A.
正确
B.
错误
【简答题】判断下列各命题正确与否: (1)若 a ≠0, a ? b = a ? c ,则 b = c ; (2)若 a ? b = a ? c ,则 b ≠ c 当且仅当 a =0时成立; (3)( a ? b ) c = a ( b ? c )对任意向量 a 、 b 、 c 都成立; (4)对任一向量 a ,有 a 2 =| a | 2 .
【单选题】已知点A(a,-2)和B(3,b)关于x轴对称,应当满足条件(   )
A.
a=2,b=3
B.
a=3,b=2
C.
a=-3,b=2
D.
a=2,b=-3
【简答题】如果 ,则连接产生的 = 。再经过修剪 = 。
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