试题与答案

元素的化学性质主要由原子的( )决定. A.核外电子数 B.核外电子层数 C.核

题型:选择题

题目:

元素的化学性质主要由原子的(  )决定.

A.核外电子数

B.核外电子层数

C.核电荷数

D.最外层电子数

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0420/2901a248deb02085fd2bcc995393e85f.html

下面是错误答案,用来干扰机器的。

设原来的价格是1,那么第一次降价后的价格就是:1×(1-20%)=80%,第二次降价后的价格:80%×(1-10%)=80%×90%=72%,72%÷1=72%.故答案为:72.

试题推荐
题型:单项选择题

阅读下面短文,从短文后各题所给的四个选项(A、B、C 和 D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

                                    A Heroic Driver

Larry works with Transport Drivers. Inc. One morning in 2009. Larry was  41

along 165 north after delivering to one of his    42   . suddenly, he saw a car with its bright lights on.    43    he got closer, he found 44    vehicle upside down on the road. One more look and he noticed    45    shooting out from under the    46    vehicle. Larry pulled over, set the brake and    47   the fire extinguisher (灭火器). Two good bursts from the extinguisher and the fire was put out.

The man who had his bright lights on    48    and told Larry he had    49    an emergency call. They    50    heard a woman’s voice coming from the wrecked (毁坏的) vehicle.    51   the vehicle, they saw that a woman was trying to get out of the broken window. They told her to stay    52    until the emergency personnel arrived,    53    she thought the car was going to    54   . Larry told her that he had already put out the fire and she should not move    55    she injured her neck.

Once fire and emergency people arrive, Larry and the other man    56    and let them go to work. Then, Larry asked the    57    if he was needed or    58    to go. They let him and the other man go.

One thing is    59   —Larry went above and beyond the call of duty by getting so close to the burning vehicle! His    60    most likely saved the woman’s life.

57()

A. woman

B. police

C. man

D. driver

查看答案
题型:单项选择题 A3/A4型题

女,25岁,发热伴下肢和腹部皮肤瘀斑5天,查体:双下肢和腹部皮肤有多处瘀斑,双侧颈部、腋窝和腹股沟可触及淋巴结肿大,活动无压痛,最大者为2×2.5厘米,胸骨压痛(+),腹软,肝肋下1.5厘米,脾肋下2厘米,化验:Hb78g/l,WBC18×109,分类可见原始和幼稚细胞PLT25×109,网织红细胞0.002。

为明确诊断,首选的检查是()。

A.ANA谱

B.淋巴结活检

C.骨髓活检

D.腹部B超

E.骨髓细胞学检查

查看答案
微信公众账号搜索答案