负数不可以进行开平方计算。

题型:判断题

问题:

负数不可以进行开平方计算。

考点:数学史数学史题库
题型:判断题

任务型阅读理解。

     Mr Green and Mrs Green 1.           a lovely son, Tom. They love him very much. Tom is only four years

old. 2. He likes asking questions.

     One day, Mr Green sits in a chair, He reads a book and he has a banana 3.           his hand. He likes to eat

bananas while reading. Tom comes in. He asks Mr Green."Dad, what's this?" Mr Green is interested in the

book. He doesn't hear Tom. Tom shakes (摇动) his father's leg and asks again,"What's this? Tell me!"

     "Leg! (腿)" says Mr Green.

     Tom goes out and says to Mrs Green, "Mum, I want to eat a leg."

1. 选择正确的单词填入(1)处: A. has B. have C. are D. is

2. 将划线(2)处的句子译成汉语:______________________________________.

3. 在划线(3)处填上一个恰当的单词______.

4. 在下面的横线上填入一个恰当的单词: Mr Green and Mrs Green are Tom's ______.

5. In fact (事实上), Tom wants to eat ______. 

    A. a chair

    B. a book

    C. a banana

    D. a leg

题型:判断题

子弹以速度v0运动时,恰能水平穿透一块固定的木板,设木板对子弹的阻力恒定,那么当子弹射入到木板三分之二厚度处时,子弹的速度为(  )

A.

1
3
v0

B.

2
3
v0

C.

6
3
v0

D.

3
3
v0

题型:判断题

隔离开关操作空载母线时,由于重击穿将会产生幅值可能超过( )、频率为数百千赫至兆赫的高频振荡过电压。

A.1.8p.u.;
B.1.9p.u.;
C.2.0p.u.;
D.2.1p.u.。

题型:判断题

纳税人取得下列( )应税所得时,必须自行向税务机关申报所得并缴纳税款。

A.取得应税所得,没有扣缴义务人

B.从两处或者两处以上取得工资薪金所得

C.分笔取得属于一次性劳务报酬所得、稿酬所得、特许权使用费所得、财产租赁所得

D.个人所得税金额较小,低于500元的

题型:判断题

旅客持经济舱客票在广州机场办理广州-阿姆斯特丹航班乘机手续,因Y舱超售被升至W舱,当航班静听北京时,北京-阿姆斯特丹经济舱有空位,泽旅客()

A.被要求坐回经济舱座位上

B.仍可坐在原座位上

C.由旅客选择

D.可坐在原座位上,但需要补差价

更多题库