已知钢筋的必需消耗量为300t,损耗率为2%,则钢筋的净用量为()t。 A.294.

题型:单项选择题

问题:

已知钢筋的必需消耗量为300t,损耗率为2%,则钢筋的净用量为()t。

A.294.12

B.294

C.306.1

D.306

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题型:单项选择题

根据短文内容判断正误。正确的写T,错误的写 F。

       Do you use your right hand more or left hand more? Very few us use both of our hands well. Most

 people use right hands, only about five people of a hundred use left hands.  New-born babies can take

  things with either of their hands, but in about two years, they like to use their right hands. Scientists don't

  know why this happens. Thcy've studied it. They think our animal ancestors used their right hands, this

 may not be true.  Monkeys are our closest. relation in the animal world. Scientists have found that

 monkeys like to use one of their hands more than the other. but it can be either hand.  There are as many

  right-handed monkeys as the left-handed ones. Next time you visit the zoo and watch the monkeys

 carefully. You'Il see that some of them will use their right hands and others will use their lcft hands, but

 men use their right hands better and this makes life difficult for the lefthanded ones.  We live in a

 right-handed world.

    Some scientists have found out that more of successful people are left-handed, but they don't know

 why.  But they are working hard to discover the secret.

( ) 1. Very few of us use both of our hands.

( ) 2. About 5% people use their left hands.

( ) 3. The left-handed live easily because most people use their left hands.

( ) 4. New-born babies use their right hands more.

( ) 5. Scientists don't know the reason why more of successful people are lcft-handed.

题型:单项选择题

下列有关离子方程式书写正确的

A.向含1molFeI2溶液中通入标准状况下22.4LCl22Fe2+ + 2I- + 2Cl2 = 2Fe3+ + I2 + 2Cl-

B.向醋酸钠溶液中通入过量CO2 CH3COO- + CO2 + H2O →HCO3- +2 CH3COOH

C.向NaHSO4溶液中滴加Ba(OH)2溶液至中性2H++ SO42- + Ba2+ + 2OH- = BaSO4↓ + 2H2O

D.以金属银为阳极电解饱和硫酸铜溶液 Cu2+ + 2H2O=" 2Cu" + O2↑+ 4H+

题型:单项选择题

有10个型号相同的零件,其中一等品5个,二等品4个,次品1个.从中随机抽取一个,抽中一等品的概率是多少

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流行性腮腺炎的好发年龄()

A.婴儿期

B.5~15岁

C.中年人

D.老年人

E.无明显年龄选择

题型:单项选择题

在信用活动中起主导作用的金融机构是()。

A.中央银行

B.政策性银行

C.投资银行

D.商业银行

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